Answer:
Carbon dioxide is added to the atmosphere by human activities. When hydrocarbon fuels (i.e. wood, coal, natural gas, gasoline, and oil) are burned, carbon dioxide is released. During combustion or burning, carbon from fossil fuels combines with oxygen in the air to form carbon dioxide and water vapor.
Explanation:
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B. Proton and neutrons in nucleus. Electron is not located at nucleus.
The earth's core makes up 16% of the earths volume, but 32% of the earths mass.
6.) the correct answer is endocytosis
