A) Antibodies produced in the body
B) Production of \[HCl\] in the stomach
C) Antibiotics taken orally or by injection.
D) Phagocytosis by WBCs
Correct Answer: B
Solution :
Houseflies does not cause or transmit disease directly. It only carry disease causing germs on their legs. When they sit on food substances, pathogens enter the food and cause diseases when consumed.
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