Final answer:
Manure and wood are considered biomass fuels, while coal is not.
Explanation:
Biomass fuels are fuels derived from organic materials like plants and animals. In the given options, manure and wood are considered biomass fuels because they come from biological sources. On the other hand, coal is not a biomass fuel as it is a fossil fuel formed from the remains of plants over millions of years.
Learn more about Biomass fuels here:
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