Ap classroom progress checks - AP Bio Unit 2 Progress Check FRQ. (a) Identify the most likely mode of transport across the membrane for substance L. Explain how information provided helps determine the most likely mode of transport. Active transport; the concentration inside the cell is 120 mM, and this is always greater than the concentration outside since the concentration ...

 
00:00:00 Slide 100:05:28 Slide 200:07:23 Slide 300:09:30 Slide 400:11:08 Slide 500:14:27 Slide 600:18:08 Slide 700:20:16 Slide 800:24:33 Slide 900:26:11 Slid.... Crime times roanoke city va mugshots

Self-studying : r/APEnvironmental. How do I unlock personal progress checks in AP Classroom? Self-studying. At the end of each unit, there are MCQ and FRQ practice tests, but I don't know how to unlock them because usually the teacher unlocks them but I'm self studying so there's no instructor. Only the teacher can unlock them.AP Classroom. AP Classroom is a free and flexible online platform that provides instructional resources for each AP course to support student learning of all course content and skills. AP Classroom r esources, including AP Daily videos, help your students learn and practice all year. Learn about all instructional resources in AP Classroom.Will administrators and AP Coordinators have access to the to the same tools (Personal Progress Checks, Question Bank, Progress Dashboard) that teachers do? Can a …AP Classroom Unit 4 Progress Check Flashcards | Quizlet. How should the student use the data collected and the known quantities from the experiment to determine the initial …AP Chemistry - AP Classroom Unit 1 Progress Check: MCQ Flashcards | Quizlet. 5.0 (24 reviews) Which of the following numerical expressions gives the number of moles in 5.0g …AP Teacher Week 2020: Learn about the Personal Progress Checks and Progress Dashboard in AP Classroom. Personal Progress ChecksPersonal Progress Checks pro... Yeah the progress checks raw score is not to be used to compute a grade. Those were always designed to be a stress-free way for student's to get a rough idea of their understanding in the course. Teachers can grade student's reflections on the progress checks. I would chat with the teacher first, and then I guess you could chat with the AP ... Study with Quizlet and memorize flashcards containing terms like The conduct of the siege as described in the passage could best be used to explain which of the following processes in the period 1450-1750 ?, The type of warfare described in the passage most directly helps to explain which of the following sixteenth-century developments?, The type of weaponry …AP ClassroomAP Classroom Unit 2 Progress Check: MCO Part B ise - Goog SUE MICHEAMO ZEM 10 18 Zima Sub 16 20 Question 1 F TB m1 m2 m3 Three boxes are pulled to the left by strings with negligible mass on a horizontal surface, as shown above. The masses of the boxes are m.my, and me, where ma >> Priction between the box and the surface is negligible.AP Biology Unit 7 MCQ. 42 terms. Emily_WorcesterDSMS. Preview. Unit 7 Progress Check: MCQ Part B. 18 terms. Stevec02041. Preview. Protein Synthesis and DNA Replication.Unit 6 Progress Check: FRQ. 4.9 (49 reviews) Flashcards; Learn; Test; Match; Q-Chat; Flashcards; ... The_Muffeen_Man. Created 3 years ago. Share. Question criteria for my AP Bio homies. Share. Students also viewed. AP Biology AP Classroom Unit 7 FRQ. 10 terms. Sivinity. Preview. AP BIO UNIT 6 FRQ. 8 terms. abbyconsiglio134. Preview. Bio Midterm ... Which of the following is an infrastructure trend supported by the data shown in the table? The economic growth and development of large metropolitan areas relates closely to the expansion of effective public transportation infrastructure. Mr barton's unit 6 test college board stuff Learn with flashcards, games, and more — for free. It declined to less than a half of its 1320 level (over 50% decline). Study with Quizlet and memorize flashcards containing terms like "Throughout its history, Central Asia has provided the ancient civilized empires on its borders with new Shahs, Sultans, or Sons of Heaven. These periodic invasions by the nomads of the steppe, whose khans ...AP HUMAN GEOGRAPHY UNIT 5 PROGRESS CHECK. 36 terms. Ava_Che. Preview. AP HUMAN GEOGRAPHY UNIT 5 PROGRESS CHECK. 36 terms. Lily_leopardgecko. Preview. AP huge midterm. 56 terms. SimranKavi. Preview. Geography and Migration Unit. 41 terms. quizlette3841864. Preview. AP HUMAN GEO MCQ APCLASSROOM REVIEW … In line 18, change else if to if. Study with Quizlet and memorize flashcards containing terms like The Fraction class below will contain two int attributes for the numerator and denominator of a fraction. The class will also contain a method fractionToDecimal that can be accessed from outside the class. public class Fraction { /* missing code ... Select two answers. mg (y0-yf)=1/2kx0^2. and. mgy0=mgyf+1/2kx0^2. A student must perform an experiment to determine the work done by a spring as it launches a block across a horizontal surface. The spring is initially compressed and the block is initially held at rest.D) Point D. An air pollution expert set up a monitoring program to determine the amount of particulate matter (PM) leaving a farmer's field after crops were harvested and the soil was bare. She set up high-volume air samplers 10 meters from each edge of the square field and collected samples weekly for two months.The supply will increase and the demand will decrease. Which of the following will happen to aggregate demand in the United States if the United States dollar appreciates in foreign exchange markets? A. Aggregate demand will decrease because net exports will decrease. Japan and the United States are trading partners with flexible exchange rates.Study with Quizlet and memorize flashcards containing terms like Based on the data in the graph, which of the following solutions most likely led to the decrease in the amount of waste sent to landfills from 1990 to 2015 ?, Based on the data in the graph, which of the following likely occurred from 1960 to 2015 because of changes in solid waste disposal methods?, …A: Personal Progress Checks can be completed in class or at home. These formative questions are designed to provide students with regular opportunities to check their understanding throughout the year – they are not intended to function as timed tests with implications for students’ course grades. What I interpret from this is that Personal ...AP Classroom · AP Daily · Teaching AP for the First ... Score is in progress: Some scores may take ... Student did not take the exam: Your AP coordinator can check&nb...AP Classroom AP Biology Unit 2 Progress Check MCQ Questions with Answer Key and Explanations. Share. Students also viewed. AP Bio Unit 2 Progress Check FRQ. 8 terms. Bobbyjoe_bruce. Preview. Biology Unit 2 Progress Check: FRQ. 8 terms. Seb1282. Preview. Biology 1111 Lab 3 Cells: Structure and Function. 28 terms. Dennisysj. Preview. …Study with Quizlet and memorize flashcards containing terms like Skill Categories, Skills, and My Scores:, Passage 1: Sredni Vashtar, Sredni Vashtar Question 1: In the third sentence of the first paragraph, the narrator's description of Mrs. De Ropp as "those three-fifths of the world that are necessary and disagreeable and real" suggests that . . . and …AP Classroom is a free and flexible online platform that provides instructional resources for each AP course to support student learning of all course content and skills. AP Classroom r esources, including AP Daily videos, help your students learn and practice all year. Learn about all instructional resources in AP Classroom. AP Classroom is a online platform that provides teachers and students with various resources and tools to prepare for AP exams. You can access progress checks, practice exams, feedback reports, and more for each unit of your AP course. AP Classroom helps you monitor your learning and improve your skills throughout the year. A. The threat of the use of nuclear weapons. Which of the following aspects of the immediate historical situation in China in 1958 best explains the author's perspective in the passage? B. Chinese leaders had made it clear that meeting the goals of the Great Leap Forward was the highest priority facing the country. For Progress Checks and Question Bank assessments, do I have to assign each section separately in AP Classroom or is there a way to assign multiple sections at the same time? Is it possible to unlock/assign a Progress Check or Question Bank assessment without giving students Select two answers. mg (y0-yf)=1/2kx0^2. and. mgy0=mgyf+1/2kx0^2. A student must perform an experiment to determine the work done by a spring as it launches a block across a horizontal surface. The spring is initially compressed and the block is initially held at rest. AP Classroom is a suite of digital tools that teachers can use throughout the year to help you prepare for the AP Exam. The tools include progress checks with multiple-choice and free-response questions your teacher can unlock for you to receive personalized feedback on the skills and topics you're learning in the course. Consider the following class definitions. public class Person {private String firstName; private String lastName; public Person(String pFirstName, String pLastName) {firstName = pFirstName; lastName = pLastName;} public void personInfo() {System.out.println("My name is " + firstName + " " + lastName);}} pubic class Teacher extends Person {private String school; private String subject; public ...AP Classroom: Unit 3 Progress Check - AP Chemistry. Which particle diagram shown above best represents the strongest intermolecular force between two ethanol, C2H6O, molecules? Diagram 2, because it shows the formation of a hydrogen bond between an H atom bonded to an O atom with an O atom from another molecule.1. The chemical reaction between HCl (aq) and NH3 (aq) is represented above. A student combines equimolar amounts of HCl (aq) and NH₃ (aq), both solutions initially at 24°C, in a coffee-cup calorimeter. The student observes that the … E, intellectual. In the second sentence of the first paragraph, the author uses the phrases "brightest blazes," "kindled," and "unexpected sparks" in order to. A, emphasize the element of spontaneity in pleasure. In the last sentence of the first paragraph, the author compares pleasure with flowers to. B, reinforce the idea that unanticipated ... AP HUG Classroom Unit 7 MCQ. 24 terms. Cs156964. Preview. Development of the Abdominal Cavity Labeling. 16 terms. bradyvlha. Preview. APHUG Unit 3 Vocab. 70 terms. daya010. Preview. APHUG Unit 7 Progress Check MCQ. 24 terms. saralhamdani. Preview. LAVRAR VOCAB CH 8. 29 terms. marley_rice90. Preview. Political Geography Terms …Select two answers. mg (y0-yf)=1/2kx0^2. and. mgy0=mgyf+1/2kx0^2. A student must perform an experiment to determine the work done by a spring as it launches a block across a horizontal surface. The spring is initially compressed and the block is initially held at rest.The molar mass of M is calculated by dividing the mass of the sample of M by the number of moles of M. A 42.0g sample of compound containing only C and H was analyzed. The results showed that the sample contained 36.0g of C and 6.0g of H. Which of the following questions about the compound can be answered using the results of the analysis?24 Mar 2020 ... AP Statistics Unit 1 Progress Check 1(a). 2.4K views · 4 years ago ...more. Brian Oliver. 294. Subscribe.The car exerts a force on the rock, and the rock exerts a force on the car. The two forces are equal in magnitude. Two objects, X and Y, move toward one another and eventually collide. Object X has a mass of 2M and is moving at a speed of 2v0 to the right before the collision.AP Chemistry - AP Classroom Unit 1 Progress Check: MCQ Flashcards | Quizlet. 5.0 (24 reviews) Which of the following numerical expressions gives the number of moles in 5.0g …i’m challenging the ap psych exam BUT my school does offer the class, so i’m enrolled under that school. i don’t know if it’s the same for you but if you go to my ap, then scroll to the ap subject you are self studying for, on the right of the name of the exam, it should say course & exam page, and ap classroom. you should click ap ...11 Feb 2023 ... This project was created with Explain Everything™ Interactive Whiteboard for iPad. 00:00:00 Slide 1 00:04:28 Slide 2 00:07:00 Slide 3 ...The car exerts a force on the rock, and the rock exerts a force on the car. The two forces are equal in magnitude. Two objects, X and Y, move toward one another and eventually collide. Object X has a mass of 2M and is moving at a speed of 2v0 to the right before the collision.For Progress Checks and Question Bank assessments, do I have to assign each section separately in AP Classroom or is there a way to assign multiple sections at the same time? Is it possible to unlock/assign a Progress Check or Question Bank assessment without giving studentsWhich of the following is an infrastructure trend supported by the data shown in the table? The economic growth and development of large metropolitan areas relates closely to the expansion of effective public transportation infrastructure. Mr barton's unit 6 test college board stuff Learn with flashcards, games, and more — for free.HC2H3O2 (aq)+OH− (aq)→C2H3O2− (aq)+H2O (l) A student carried out a titration using HC2H3O2 (aq) and NaOH (aq). The net ionic equation for the neutralization reaction that occurs during the titration is represented above. The NaOH (aq) was added from a buret to the HC2H3O2 (aq) in a flask.B. believes that White Virginians must learn to protect themselves if they are to expand their settlements. C. values the lives of White Virginians equally with those of allied American Indians. D. feels a responsibility to protect White frontier settlers from violent encounters with American Indians. A) [The diagram shows a nitrogen atom bonded to two Hydrogen atoms and an oxygen atom; the Oxygen atom is bonded to a third Hydrogen atom] Which of the Lewis diagrams shown above is the more likely structure of CO2, and why? A) Diagram 1, because all the atoms have a formal charge of 0. Personal Progress Checks assess students’ understanding of all the topics and skills within a unit. After students complete a Personal Progress Check, teachers can use the …18 Mar 2020 ... Comments2. Gurjeet Singh. can students do these themselves as in India we don't have ap classroom teachers?Study with Quizlet and memorize flashcards containing terms like The distribution of heights for adult men in a certain population is approximately normal with mean 70 inches and standard deviation 4 inches. Which of the following represents the middle 80 percent of the heights?, The distribution of the amount of water used per wash cycle, in gallons, by a … The dispositional hypothesis stated that some people have certain character traits which lead them to naturally be more aggressive and distrustful of authority. These people can be thought of as having a prisoner personality. Other people have character traits in which they enjoy having control or authority over others. AP Classroom is a platform that provides online formative assessments for AP courses. You can access unit 1 progress checks to measure your understanding of the course content and skills. These assessments are aligned with the AP exam and can help you review the foundational concepts and practices of AP courses.Unit #5 AP Bio Classroom Progress Check. R.C. Punnett conducted experiments on the inheritance of traits in the sweet pea, Lathyrus odoratus. In one experiment, he crossed two different true-breeding sweet pea plant strains, one with erect petals and long pollen, and the other with hooded petals and round pollen. all of the offspring (F1 ...Study with Quizlet and memorize flashcards containing terms like A consumer group is investigating the number of flights at a certain airline that are overbooked. They conducted a simulation to estimate the probability of overbooked flights in the next 5 flights. The results of 1,000 trials are shown in the following histogram.AP Classroom is a online platform that provides teachers and students with various resources and tools to prepare for AP exams. You can access progress checks, practice exams, feedback reports, and more for each unit of your AP course. AP Classroom helps you monitor your learning and improve your skills throughout the year.AP Classroom is a platform for AP Precalculus teachers and students to access online resources and assessments. You can find unit-based progress checks, topic questions, and practice exams to help you prepare for the AP …Unit 5 Progress Check: APC MCQ Part A. AP Calculus AB. 12 terms. dillon_chen6. Preview. Know or Dies ... Unit 7 👻. 19 terms. mboya6. Preview. concavity quiz. 12 terms. Cydnee_Barefield. Preview. Unit 5 Progress Check: MCQ Part A. 7 terms. xchris06. Preview. Axis of Symmetry, Average Rate of Change, and Graphs. Teacher 19 terms. …AP Classroom is a online platform that provides teachers and students with various resources and tools to prepare for AP exams. You can access progress checks, practice exams, feedback reports, and more for each unit of your AP course. AP Classroom helps you monitor your learning and improve your skills throughout the year.18 Apr 2020 ... AP Classroom Unit 6 Progress Check MCQ Part B 4 5 8. 19K views · 4 years ago ...more. Try YouTube Kids. An app made just for kids.Hereditary spherocytosis (HS) is a disorder of red blood cells that causes the cells to be smaller and spherical instead of having the usual flattened, biconcave shape. The average diameter of normal red blood cells is 7.2μm, and the average diameter of red blood cells in a person with HS was found to be 6.7μm. Giving Exams on AP® Classroom using the Question Bank. Choose “High” Alignment questions in the question bank as these most closely match the new CED. Check your FRQs before assigning. In some FRQs, students have to solve a problem on paper (math, graphing, etc), take a picture and upload to the FRQ. This will require you helping students ... The dispositional hypothesis stated that some people have certain character traits which lead them to naturally be more aggressive and distrustful of authority. These people can be thought of as having a prisoner personality. Other people have character traits in which they enjoy having control or authority over others. AP Classroom is a platform that provides online formative assessments for AP courses. You can access unit 1 progress checks to measure your understanding of the course content and skills. These assessments are aligned with the AP exam and can help you review the foundational concepts and practices of AP courses.AP Classroom is a platform that helps you prepare for the AP Exams with personalized feedback and practice. You can access progress checks, question bank, and reports for each unit.For Psychology the progress checks are a lot harder than the tests. For lang, they were definitely harder than the real deal. For physics, it’s absurdly more difficult imo. Some questions were deemed “terribly written” by our teacher and she’s been teaching it for like 10+ years. 312K subscribers in the APStudents community.The value of "All men are created equal" was reaffirmed both in law and in American political culture. The police search a suspect's smartphone without getting a warrant and found photo evidence of criminal activity. After a thorough investigation, the suspect was charged and the evidence obtained from the smartphone was used in the trial.Select two answers. The block has its maximum acceleration at all times 0.5n, where n is a zero or a whole number. B. The block has maximum spring potential energy at all times 0.5n, where n is a zero or a whole number. Study with Quizlet and memorize flashcards containing terms like What is the magnitude of the change in potential energy of ...a step pyramid. The Qorikancha in Cusco functioned as a. shrine. The painter of this work conveys the movement and energy of the subject by. repeating figures and similar forms facing in the same direction. San Ildefonso Pueblo artists Maria Martínez and Julian Martínez created their black-on-black ceramic vessel by.A. 0.340. What is the volume of the solid generated when the region in the first quadrant bounded by the graph of y=√100−4x^2 and the x- and y-axes is revolved about the y-axis? B. 523.599. Let R be the region in the first quadrant bounded by the graph of y=2tan (x/5), the line y=5−x, and the y-axis.AP HUMAN GEOGRAPHY UNIT 5 PROGRESS CHECK. 36 terms. Ava_Che. Preview. AP HUMAN GEOGRAPHY UNIT 5 PROGRESS CHECK. 36 terms. Lily_leopardgecko. Preview. AP huge midterm. 56 terms. SimranKavi. Preview. Geography and Migration Unit. 41 terms. quizlette3841864. Preview. AP HUMAN GEO MCQ APCLASSROOM REVIEW …24 Sept 2023 ... topic found on the “AP Precalculus Unit 1 Progress Check A” in AP classroom on the College Board website. To download the packet used in ...C. double result = secret (4, 4.0); Consider the following method, which returns the lesser of its two parameters. Assume that each of the following expressions appears in a method in the same class as the method min. Assume also that the int variables p, q, and r have been properly declared and initialized.00:00:00 Slide 100:05:28 Slide 200:07:23 Slide 300:09:30 Slide 400:11:08 Slide 500:14:27 Slide 600:18:08 Slide 700:20:16 Slide 800:24:33 Slide 900:26:11 Slid...D) 5.6×1014 s−1. In an experiment on the photoelectric effect, a photon with a frequency of 7×1014s−1 was absorbed by a sample. What is the approximate energy of this photon? A) 5×10−19 J. The frequency and energy ranges of photons in some parts of the electromagnetic spectrum are given in the table above.Molly is potty training her daughter, Mia. Every time Mia begins to urinate in her diaper, Molly says the word "bathroom" in the hope that Mia will begin to urinate when she hears this word while sitting on the toilet. Molly's efforts most resemble the studies of. Ivan Pavlov, who studied classical conditioning.AP Chemistry - AP Classroom Unit 1 Progress Check: MCQ Flashcards | Quizlet. 5.0 (24 reviews) Which of the following numerical expressions gives the number of moles in 5.0g …An experiment is conducted in which a cart travels across a horizontal surface and collides with a wall. Data collected from the experiment are used to create the graph of the cart's velocity as a function of time. All frictional forces are considered to be negligible. Which data from the graph should the student use to determine the direction ...A decrease in income taxes is an expansionary fiscal policy that will increase aggregate demand, resulting in an increase in real output and the price level. Both policies are expansionary and will result in a decrease in unemployment. 3 multiple choice options. Use the graph below of a long-run Phillips Curve (LRPC) (LRPC) and a short-run ...Antiphospholipid syndrome (APS) is an autoimmune disorder that involves frequent blood clots (thromboses). When you have this condition, your body's immune system makes abnormal pr... AP Classroom. AP Classroom is a free and flexible online platform that provides instructional resources for each AP course to support student learning of all course content and skills. AP Classroom r esources, including AP Daily videos, help your students learn and practice all year. Learn about all instructional resources in AP Classroom. A: Personal Progress Checks can be completed in class or at home. These formative questions are designed to provide students with regular opportunities to check their understanding throughout the year – they are not intended to function as timed tests with implications for students’ course grades. What I interpret from this is that Personal ...An experiment is conducted in which a cart travels across a horizontal surface and collides with a wall. Data collected from the experiment are used to create the graph of the cart's velocity as a function of time. All frictional forces are considered to be negligible. Which data from the graph should the student use to determine the direction ... AP Classroom is a free and flexible online platform that provides instructional resources for each AP course to support student learning of all course content and skills. AP Classroom r esources, including AP Daily videos, help your students learn and practice all year. Learn about all instructional resources in AP Classroom.

The molar mass of M is calculated by dividing the mass of the sample of M by the number of moles of M. A 42.0g sample of compound containing only C and H was analyzed. The results showed that the sample contained 36.0g of C and 6.0g of H. Which of the following questions about the compound can be answered using the results of the analysis?. Handi house ocala florida

ap classroom progress checks

Lines 5 and 6. The changes reflected in which of the following lines in the table are most directly associated with the emergence of debates about the nature and causes of climate change in the late twentieth and early twenty-first century? Lines 4 and 9. Which of the following best explains how a supporter of free trade and market deregulation ...vT=1/√3 v0. A car travels with a tangential speed v1 around a curve of radius r and turns to the left, as shown by the rear view of the car in Figure 1. A force diagram of the forces exerted on the car with speed of 5m/s as it turns is shown in Figure 2. A force diagram of the forces exerted on the car with speed v as it turns around the same ... AP Classroom is a free and flexible online platform that provides instructional resources for each AP course to support student learning of all course content and skills. AP Classroom r esources, including AP Daily videos, help your students learn and practice all year. Learn about all instructional resources in AP Classroom. AP Lang Unit 6 MCQ Progress Check. 18 terms. Saifan_Chow. Preview. AP HUMAN GEO MCQ APCLASSROOM REVIEW UNIT 6. 33 terms. BrendanChanPeriod3. Preview. colonial America 2. Teacher 23 terms. sarah29r46. Preview. FDR and the new deal study guide . 34 terms. clarefoy. Preview. Unit 6 Progress Check: MCQ. 18 terms. Zain6672. Preview. … A) [The diagram shows a nitrogen atom bonded to two Hydrogen atoms and an oxygen atom; the Oxygen atom is bonded to a third Hydrogen atom] Which of the Lewis diagrams shown above is the more likely structure of CO2, and why? A) Diagram 1, because all the atoms have a formal charge of 0. This check on presidential power illustrates that. the process of confirming members of the president's Cabinet can lead to conflict with members of the Senate. On February 13, 2016, following the death of Supreme Court Justice Antonin Scalia, Senate Majority Leader Mitch McConnell issued a statement that the Supreme Court vacancy should be ...Personal Progress Checks assess students’ understanding of all the topics and skills within a unit. After students complete a Personal Progress Check, teachers can use the class report to discuss common challenges with students, identify topics to reteach, and to help focus student review. 2020 College Board. 01794-070-04.A decrease in income taxes is an expansionary fiscal policy that will increase aggregate demand, resulting in an increase in real output and the price level. Both policies are expansionary and will result in a decrease in unemployment. 3 multiple choice options. Use the graph below of a long-run Phillips Curve (LRPC) (LRPC) and a short-run ...Do you want to prepare for the AP Computer Science A exam? Do you need to review the concepts and syntax of ArrayList in Java? If so, check out this Quizlet flashcard set that covers the multiple-choice questions from Unit 7 Progress Check. You will learn how to create, manipulate, and access ArrayList objects of different types, and test your …Select two answers. The block has its maximum acceleration at all times 0.5n, where n is a zero or a whole number. B. The block has maximum spring potential energy at all times 0.5n, where n is a zero or a whole number. Study with Quizlet and memorize flashcards containing terms like What is the magnitude of the change in potential energy of ...4.8 (15 reviews) The disintegration of the Abbasid Caliphate most directly led to which of the following political developments in the Islamic world in the thirteenth century? Click the card to flip 👆. The disintegration of the Abbasid state resulted in the emergence of numerous Islamic states controlled by Turkic peoples. Long before the ...The claim is not plausible because 10 falls outside of the interval. Study with Quizlet and memorize flashcards containing terms like A sociologist is studying the social media habits of high school students in a school district. The sociologist wants to estimate the average total number of minutes spent on social media per day in the population.Have you recently filed a complaint with the Better Business Bureau (BBB) and want to know its current status? The BBB provides consumers with a simple and transparent process to t...AP Classroom.

Popular Topics