Mammals Sexual reproduction

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there 3 extant kinds of mammals: monotremes, placentals , marsupials, internal fertilization. in placental mammals, offspring born juveniles: complete animals sex organs present although not reproductively functional. after several months or years, depending on species, sex organs develop further maturity , animal becomes sexually mature. female mammals fertile during periods during estrous cycle, @ point ready mate. individual male , female mammals meet , carry out copulation. mammals, males , females exchange sexual partners throughout adult lives.








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