Q.

The harmful substances produced by the microbes are known as –

A. Antibiotics
B. Pollutants
C. Hormones
D. Toxins
Answer» D. Toxins
Explanation: Toxins are substances created by plants and animals that are poisonous to humans. Most toxins that cause problems in humans are released by microor-ganisms such as bacteria, viruses, fungi, rickettsiae or protozoa. For example, cholera is due to a bacterial toxin.
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