Given the following components:(1) lions and zebras(2) carbon dioxide and oxygen(3) grass(5) decomposers(6) the sun(7) nutrients(8) soil, air, and waterWhich are needed to have a functioning ecosystem?
A. All of them.
B. Only 2, 3, 7, and 8
C. Only 1, 3, 5, and 7.
D. All but 2.
Answer: A
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