Question at position 39 On a holistic scale, the complement system plays a role inspecific pathogen defenses.None of the answers are correct.nonspecific pathogen defenses.All of the answers are correct.both specific and nonspecific pathogen defenses.单项选择题

A

specific pathogen defenses.

B

None of the answers are correct.

C

nonspecific pathogen defenses.

D

All of the answers are correct.

E

both specific and nonspecific pathogen defenses.

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The evolutionary mechanism to keep us safe is the:

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