Answer:
The first one is A. The second one is A and the last one is B.
Explanation:
I did it on USATestPrep
Answer:
Explanation:
I think it's animal respiration because animals inhale oxigen and they exhale carbon dioxide.
What it eats, what weather it's build for and DNA
Carbon atoms have more mass than other atoms. They have 6 protons and 6 neutrons plus 6 electrons!