The hear makes sure that oxygen taken in by the lungs gets to the brain.
Amino acids is the correct answer (:
Explanation:
Why (for what reasons) is it believed that oxygen was not present when life formed on Earth? The life forms were anaerobic, and did not make oxygen. There is a lack of oxidized iron in rocks that are a few billion years old. Eventually oxygen from the oceans moved into the atmosphere, and iron could be oxidized.
Answer:
Relief, elevation, and landforms
Explanation:
Topography is the shape of a land. It's elevation, land form, and relief.
Decomposers are bacteria that break down decomposing or rotting dead organisms, or something that was alive one (weather it be human or just nature) and slowly dies away with the help of decomposers. hope this helps.
