Guyss plzz hel... Include a Half-Life question that asks how much is left after X years, then show how to solve it. oxygen

What is the study of how matter and energy interact? a. biology b. physics c. planetary science d. chemistry

As you move from right to left on the periodic table the atomic radius fill in the blank

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.