Which of the following statements best captures an aspect of the role of hormones in the body?

Which of the following statements best captures an aspect of the role of hormones in the body?
Some chemical substances can function as either hormones or neurotransmitters.
Hormones directly initiate many of the processes that contribute to homeostasis.
Control of body processes is ensured by the fact that a single hormone can only exert one effect on one specific system or tissue.
Each hormone that exists in the body is produced by only one specific endocrine gland.

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