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olganol [36]
3 years ago
9

Which is the first part of the immune system to attack an invader?

Biology
2 answers:
Karo-lina-s [1.5K]3 years ago
6 0

Answer:

the answer to this question is the blood cells.

zaharov [31]3 years ago
4 0

Answer:

B. Macrophages

Explanation:

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