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What are hormones? A. They are minerals needed for proper bone formation. B. They are substances needed for muscle and nerve activity. C. They are the parts of the body targeted by endocrine glands. D. They are substances released by endocrine glands.

User Rodolph
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I think it is D because hormones are substances released by endocrine glands
User Yeshansachithak
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Answer:

D substances released by endocrine glands

User Armin Taghavizad
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