Describe how a fuel cell works

A fuel cell works by passing hydrogen through the anode of a fuel cell and oxygen through the cathode. ... At the cathode, the protons, electrons, and oxygen combine to produce water molecules. Due to their high efficiency, fuel cells are very clean, with their only by-products being electricity, excess heat, and water.

Explanation:

b) mutualism

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if you mean hydrogen and oxygen then water is the product