The chemical messengers that cats as a signaling molecules are called hormones. The levels of hormones in the body are regulated by a feedback loop. Thus, option B is correct.
The feedback loop is the mechanism that uses the output of the process to act as the signal for the process to continue or halt. The output can also be used as an input and works in a cyclic pattern.
The positive loop increases the response towards the hormonal activity whereas the negative loop reduces the action toward the hormones released.
Therefore, option B. the feedback loop regulates the hormonal level in the body.
Learn more about the feedback loop here:
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