Answer:
c is your answer there u go
Explanation:
The answer is "elements" :)
Oxygen gas was most likely absent from Earth's primitive atmosphere. The current theory is that the Earth's early atmosphere was composed of mainly carbon dioxide and methane due to the high volcanic activity. Cyanobacteria and their use of photosynthesis was what caused earth's atmosphere to become oxygen enriched.
I hope that helps.
The answer is D because moving all of the body parts would get the heart racing and the blood pumping!