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Ber [7]
3 years ago
9

The nations of the world agreed to preserve Antarctica for

Biology
2 answers:
Archy [21]3 years ago
4 0
D the expansion of their territory
Ksenya-84 [330]3 years ago
3 0

Answer: is B scientific research.

Explanation:

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Antigens are secreted by the endocrine system

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