Answer:
he would have 7 cookies left.
Explanation:
This is because 10 - 3 = 7
If you have any questions feel free to ask in the comments - Mark
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Answer:
carbon
Explanation:
Many organisms use carbon to make calcium carbonate, a building material of shells and skeletons. Other chemical processes create calcium carbonate in the water. The using up of carbon by biological and chemical processes allows more carbon dioxide to enter the water from the atmosphere.