Respuesta :
The human female reproductive cycle is regulated primarily by the hormones of the endocrine system. Thus, option "D" is correct.
What are the two main classes of hormones?
There are two major classes of hormones 1. Proteins, Peptides, and modified amino acids 2. Steroids. In general, steroids are se× hormones related to se×ual maturation and fertility.
Thus, option "D" is correct.
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