10. In the human body, each hormone is regulated by certain genes. These genes are turned on at times and turned off at other times. Which best explains this process?
F. Genes are regulated by hormones secreted by the endocrine system.
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G. The regulation of genes is directly controlled by the nervous system.
H. Genes are directly regulated by hormones found in the integumentary system.
J. The regulation of genes is only affected by external factors.