give difference on the category of gases in the troposphere​

how to write a persuasive writting on this topic Are exams the proper measuring stick for student performance? Read the entry on Jonas Salk from Compton's Encyclopedia/The Britannica School Edition, and answer the question beneath the text.Compton's EncyclopediaJonas Salk (1914-1995). For the first half of the 20th century, poliomyelitis, also known as infantile paralysis, was one of the most dreaded diseases to attack young people. By 1955 American physician and researcher Jonas Salk had developed a vaccine that almost eradicated the disease in the United States and other developed countries.Jonas Edward Salk was born in New York City on October 28, 1914. He graduated from the City College of New York in 1934 and earned his doctorate in medicine from New York University's College of Medicine in 1939. While in medical school he had worked with Thomas Francis Jr. on killed-virus immunology studies. In 1942 he joined a group at the University of Michigan working on a vaccine against influenza. The vaccine was perfected in 1953.In 1947 Salk became associate professor of bacteriology and head of the Virus Research Laboratory at the University of Pittsburgh School of Medicine. There he began working on the polio vaccine. Three viruses caused polio, and a vaccine had to be effective against all of them. By 1952 Salk had developed such a vaccine and conducted field tests on children. His findings were published in 1953, and a mass field test was done the next year.On April 12, 1955, the vaccine was released for use in the United States. In 1957 Salk was named professor of experimental medicine at Pittsburgh, and in 1963 he went to San Diego as head of the Institute (later named the Salk Institute) for Biological Studies. In 1977 Salk was awarded the Presidential Medal of Freedom. He died on June 23, 1995, in La Jolla, California.Answer the following question based on the Compton's Encyclopedia reading:What was one of the challenges Dr. Salk faced in his attempt to create a polio vaccine? Dr. Salk did not have enough money to pay for his research and supplies. Dr. Salk had to create one vaccine that was effective against three different viruses. Dr. Salk had to convince government officials to allow him to test the vaccine. Dr. Salk's idea for a vaccine was not supported by other scientists and physicians. Help!!!!!! Math problems Which of the following terms best describes government contributions of funds?Which of the following terms best describes government contributions of funds?subsidiessponsorshipssecuritiessafeties solve this problem as a fraction in the lowest terms Blake bought a new car. He borrowed $12,500 from the bank. After 4 years he had paid off the loan and paid $1500 in interest. What rate did he borrow at? Include the steps you used to solve the problem and your answer Find the area of the composite figure. First, find the area of the triangle. 3 cm Triangle Area = [?] cm2 6 cm Rectangle Area = [] cm2 9 cm Total Area of Composite Figure = [ ] cm2 Enter Factorise: 3x^2-2x-5 please tell this my sister question tomorrow is her paper Select the correct location on the image.Which structure fuses to form a diploid zygote during sexual reproduction? y = 2x + 4 and y = 3x+ 2 Answer please I would appreciate it :) Can you please help me figure out the work for the missing quantities? PLEASE HELP! IM ALMOST DONE WITH THIS ASSIGNMENT PLSSS HELPP ILL GIVE BRAINLIEST SHOW UR WORKquestion: solve the solution using substitution. help me plisswhich one is supposed to be correct? 8 times a certain number is added to 5 times a second number to give 184.the first number minus the second number is -3.find these number . Ocean acidification is occurring becauseA. of agricultural runoff into rivers.B. the ocean absorb about 25% of the carbon dioxide emitted into the atmosphere by human activities.C. water changes pH as it warms.D. overfishing is changing the structure of ecosystems, haring the plankton that regulate the pH of ocean water.E. acid rain has worsened over the last two decades. Pupil who scored 60 in her maths test was absent for English predict what her English mark could have been What is the slope between (2,1); (5,9) Mrs. Meier bought 5 pounds ofcarrots for $1.75. Which representsthe same price per pound?