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5 September, 14:45

What is a hormone?

a. it is a gland that is produced by the endocrine system

c. it is a chemical messenger that is produced by the excretory system

b. it is a chemical messenger that is produced by the endocrine system

d. it is a chemical messenger that is produced by an exocrine gland

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  1. 5 September, 16:48
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    It is a chemical messenger that is produced by the endocrine system.
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