Where did the matter come from that formed the plant parts? When new plants grow, does the total mass of Earth increase, decrease, or stay the same?Explain your thinking.

The mass of a tree is primarily carbon. The carbon comes from carbon dioxide used during photosynthesis. During photosynthesis, plants convert the sun's energy into chemical energy which is captured within the bonds of carbon molecules built from atmospheric carbon dioxide and water.

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i think the answer is a, hope this : )

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