Answer:
How the Muscular and the excretory system work together. The Muscular system helps the Excretory system by moving waste through the body and protect its organs. The Excretory system helps the Muscular system by getting rid of carbon dioxide from the muscles.
Explanation:
The answer is A: phytoplankton provides nutrients to consumers in the ecosystem.
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Niches, trophic levels, and ecological processes of a biological community.
A metallurgical microscope