Answer:
A
Explanation:
Today, the atmosphere holds about 21 per cent oxygen. ... When the first simple organisms appeared in the oceans more than 3.5 billion years ago, the atmosphere was mostly nitrogen, hydrogen, water vapor, and carbon dioxide
4% of the carbon atom’s second energy level is filled.
Hope this helps :)))
Answer:
All populations must have an adequate amount of food, water, shelter, and space to maintain homeostasis
Answer:
Photosynthesis
Explanation:
Bacteria can obtain energy and nutrients by performing photosynthesis, decomposing dead organisms and wastes, or breaking down chemical compounds.
