Q.

What is a disease vector?

A. An organism that transmits a disease-causing agent
B. A type of bacteria that causes severe illness
C. A contaminated food or water source
D. A person who carries a disease but shows no symptoms
Answer» A. An organism that transmits a disease-causing agent
Explanation: A disease vector is an organism, like a mosquito or rat, that transmits a disease-causing agent from an infected individual to a healthy individual.
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