Maybe review over the text it’s talking about. I would help but there is not text for what you are needing help with. Try putting a photo of the text your questions are linked to? Then it would be easier to help with what your asking.
The layers of the atmosphere differ in temperature and density.
<span>. c.Scientists studied the trapping of gases in the atmosphere.</span>
Answer:
make of no use or value; cancel out= nullify
(of fabric) filled with air and swelling outwards = billowing
To me, the most likely answer would be A.
