Answer: The answer is B while neutrons and electrons are usually the same in a given atom protons are always consistent.
I believe the answer you're looking for is cellular respiration.
Answer:
I think its A
Explanation:
Because the reason why airplane have closed windows is because we can't breathe in carbon dioxide when we go up. Of course there is oxygen just not a lot as we go up. Why would there be helium in the air? We would sound weird when we skydive.
The answer is C hope this helps!
