Explanation:
Oxygen is the answer. (option B)
Amobeo is very bigger then 2 and yeha j think
Either fibrillation or Cardiac Arrest
Answer:
Earth's atmosphere is roughly 78 percent nitrogen and 21 percent oxygen, with trace amounts of water, argon, carbon dioxide and other gases. Nowhere else in the solar system is there an atmosphere loaded with free oxygen, which is vital to one of the other unique features of Earth: life