Answer:
Sunlight (not sure why it said 'chemicals' instead of sunlight)
Explanation:
A. water
B. sunlight
C. glaciers
D. wind
Under and underneath are synonyms. They mean almost the same thing, so just replace "underneath" in the sentence with "under".
I think it’s either b or c
An oppositive does not function like an adverb in a given sentence.
C. how Central ideas connect
