Answer:
Cellular respiration that proceeds in the absence of oxygen is anaerobic respiration. Cellular respiration that proceeds in the presence of oxygen is aerobic respiration. Anaerobic respiration evolved prior to aerobic respiration.
Your brain stem would be your answer
The best answer is C
Hope it helped!! :)
I believe the answer is Density have a very nice day
I believe it’s B? I just dug out my old cell theory stuff lol that’s what Im gathering from it