Question

How waste products are useful to man kind? (this is not English its bio)

Answer 1

Explanation:

Waste (or wastes) are unwanted or unusable materials. Waste is any substance which is discarded after primary use, or is worthless, defective and of no use. A by-product by contrast is a joint product of relatively minor economic value. A waste product may become a by-product, joint product or resource through an invention that raises a waste product's value above zero.

Examples include municipal solid waste (household trash/refuse), hazardous waste, wastewater (such as sewage, which contains bodily wastes (feces and urine) and surface runoff), radioactive waste, and others.

Answer 2

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☞.Tannin is a waste product of plants and is stored in leaves and bark. ... Many of these leaves are used in our food and/or for fragrance. Some plants generate toxic waste products, which are useful to human beings. Caffeine, morphine and nicotine are examples of such wastes and are used in beverages, medicines, etc.

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