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    Biology The Unity Diversity
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    Exam 34: Endocrine Control
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    Researchers First Discovered the Existence of Hormones by Studying Secretions
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Researchers First Discovered the Existence of Hormones by Studying Secretions

Question 69

Question 69

Multiple Choice

Researchers first discovered the existence of hormones by studying secretions from the ________.  


A) adrenal glands
B) pancreas
C) gonads
D) thymus gland
E) pineal gland

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