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

Option B (it is a chemical messenger that is produced by the endocrine system)

Explanation:

Hormones can be defined as the product of endocrine glands which help in the regulation of physiological and behavioral activities like metabolism, growth, development, stress management, tissue functions and many more.

Endocrine glands are governed by the endocrine system. Endocrine glands releases hormone directly into the bloodstream instead of ducts.

Therefore, the correct answer is "Option B".

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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