Primary sex determination results from DNA directing the production of either testes or ovaries in the embryo. What then determines secondary sexual characteristics?
A) Electrical signals from the nervous system of the testes or ovaries drive further sexual development.
B) DNA from the testes or ovaries drive further sexual development.
C) Blood flow from the tests or ovaries drive further sexual development.
D) Hormones secreted by the testes or ovaries regulate whether male or female sexual structures form in the embryo.
E) Puberty determines secondary sex characteristics.
Correct Answer:
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