The answer is A: phytoplankton provides nutrients to consumers in the ecosystem.
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It can cause a tumor which leads to cancer
Solvents are dissolved in a solute to create a solution. Some examples are sugar solutions, where sugar is the solvent, water is the solute, and the solution is the sugar water that results, as long as the sugar is dissolved evenly in the water.
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Rocks? not quite sure about this one but good luck and hope this helps! :)