That would be A. Photosynthesis.
It represents a cold front
Going with my gut, I'd say D. But I would consult the NASA website, because they'd probably have something there about the lunar cycle. But I hope this helps!
My guess would be A. B isnt right because you dont need a whole organ to grow an organ, but just a few of its cells. C isnt good either because you can control what stem cells will develop into by taking a cell from whatever is need, and d just doesnt make sense to me.
Answer:
ok yes it changes but what is the question
Explanation:
