20
AssignmentMultiple Choice

Causes of Disease

Question 20 • 2026-2027 EDGE Human Anatomy and Physiology A

Which of the following statements is correct about a lake contaminated with pathogenic bacteria?

Answer
A
The bacteria is the indirect cause of disease.
B
The bacteria is an environmental factor.
C
The water is the indirect cause of disease.
D
The water is the direct cause of disease.

Explanation

Pathogenic bacteria are the disease-causing agents, so they are the direct cause of infection. The lake water carries the bacteria to people, making the water an indirect cause of disease. Therefore, “The water is the indirect cause of disease” is correct.

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