Biology, 02.09.2019 17:30 ayahabdulhaqq2

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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What is a hormone?
a. it is a gland that is produced by the endocrine system
c. it is a...