Chemical signals that affect the behavior of other glands or tissues are called:

A. serous secretions.
B. mucus.
C. synovial fluid.
D. hormones.



Answer :

Final answer:

Hormones are signaling molecules that regulate physiology and behavior by affecting other glands or tissues. They are produced by endocrine glands and transported through the circulatory system to target organs.


Explanation:

Hormones are chemical signals that affect the behavior of other glands or tissues in multicellular organisms. They are produced by glands in the endocrine system, transported through the circulatory system, and regulate various physiological processes. For example, hormones like insulin control blood sugar levels, while adrenaline impacts the body's response to stress.


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