I really need help on this

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?