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Which of the following best summarizes how hormone levels are controlled?

Group of answer choices

Hormones are controlled by a feedback loop; information about a system is sent back to the controller of the system to improve its function.

Hormones are controlled by oxygen levels; the internal environment maintains all systems, including endocrine functions.

Hormones are controlled by muscles; hormones are released when muscles contract and stopped when muscles relax.

Hormones are controlled by the nervous system; the spinal cord sends messages about hormone levels to the brain.