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== Male ==
 
== Male ==
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* Os penis lies within the tissue of the penis.
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 +
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* Two testes in an external scrotum.
 
* Testes descend at 30-40 days.
 
* Testes descend at 30-40 days.
 
* Active spermiogenesis and mating apparent from 10 weeks of age.
 
* Active spermiogenesis and mating apparent from 10 weeks of age.
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