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lesantik [10]
4 years ago
7

Which line of defense includes active immunity?

Biology
2 answers:
Valentin [98]4 years ago
7 0

Answer:

secound

Explanation:

inysia [295]4 years ago
5 0
If Im on the right track i believe it is A system that relies on antigens which are specific substances found in foreign microbes. Most antigens are proteins that serve as the stimulus to produces an IMMUNE response. 
HOPE THIS HELPS!!!
:)
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