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Which of the following statements is true?

Opportunistic bacteria only cause infection under certain conditions.
Most bacterial infections are caused by bacteria already in the body.
Leukocytes are the first line of defense against pathogenic microorganisms.
The flu and the common cold are treated with rest, fluids, and antibiotics.

User Iducool
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2 Answers

1 vote

Answer:

1 one is true

2 is true

3 is falase

User Yevgeniy
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5.1k points
3 votes

Answer:

a

Step-by-step explanation:

User Kolisko
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