Respiration takes place in the mitochondria
I believe its A because a bonds with t g bonds with c and c bonds with g, translated to rna it's UCG.
Answer:
i don't know if im right but honestly i could be A B or C
Explanation:
but i would say if its humans adapting to the environment and if an animal probably the same thing but maybe A more than C
Ok I think its small polar molecules but I could be wrong.