Answer:
1 : The urogenital opening is where bodily waste and reproductive fluids are expelled to the environment outside of the body cavity.
2 : Most male mammals have testes in an external sac because the testes need to be cooler than the temperature of the rest of the body. As the testes house the sperm of male mammals, the fact that they are in an external sac, allows the prevention of premature activation of sperm, due to their cooler temperature.
3 : The vaginal orifice simply means the opening to the vagina itself.
Step-by-step explanation:
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