This happens in the second trimester. I'm pretty sure that's the right answer. I hope it helps!
Carbohydrates, all coming from the process of photosynthesis, represent the major ... out many functions in all living organisms and are the major energy source in a ... number of oxydrilic groups (so polyhydroxy aldehydes or ketones as well).
the one that makes the most sense to me is C. sorry if im wrong