Do you mean electron? If so they are molecules that transport electrons during cellular respiration.
Biome
a complex biotic community characterized by distinctive plant and animal species and maintained under climatic conditions of the region, especially such as a community that has developed to climax.
Answer:
c
Explanation:
cause the less the vapor the more the direct heat
The answer is The Nervous System.
It interacts with all the other systems, it tells them what to do.
Hope it helps!
I think tracheae which is B not sure tho
