I think the answer is farmers.
The answer is A. It shows that animals depend on this process for oxygen.
Photosynthesis is how Carbon dioxide (what we breathe out) is turned into Oxygen (what we breathe in)
If Photosynthesis never took place Oxygen would run out and animals would suffocate.
The excerpt that starts with Yet Gregor's sister was playing so beautifully.
He enjoys the music and it moves him even though he is an insect
