Research has been done in using hydrogen fuel cells to power cars. The hydrogen fuel cells use hydrogen and oxygen gases to release energy, forming water as a by-product. Explain why hydrogen fuel cells are good alternative sources of energy.
A. Hydrogen fuel cells are safe to use as an energy source.
B. Hydrogen fuel cells use gaseous materials as fuels.
C. Both hydrogen and oxygen gases are readily available.
D. Water is a by-product.
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the answer is D. Water is a by-product.
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