(1) What happens to the amount of air molecules at high altitudes? (2) What happens to the temperature of air at high altitudes?
(3) What happens to air pressure at high altitudes?

Please, Answer in complete sentences.
Thank you.
(P. S.: I had to mark this class as Chemistry because, Earth Space Science isn't an option)

Why is it important for scientists to review and repeat the work of other scientists? 1.a scientific theory must be tested three times before it is proven. 2.the scientific method only applies to repeated experiments. 3.an experiment may have had errors that the scientists didn't recognize. 4.the results of individual scientists may be influenced by bias. 5.an experiment must be performed twice before the data can be analyzed.