In humans, when do the secondary sexual characteristics first appear?

Webcorrectly label the following external genitalia of the developing male and female embryo.

Webthe embryonic stage lasts through the eighth week following fertilization, after which the embryo is called a fetus.

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Explain the expansion of the ventricular system of the adult brain from the.

Webrelate the different stages of development to the adult structures of the central nervous system.

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