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Placental mammals


Placental mammals
In placental mammals, the extraembryonic membranes form a placenta and umbilical cord, which connect the embryo to the mother's uterus in a more elaborate and efficient way.
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placental mammals: mammals that have a nutritive connection between the embryo and the mother's uterine wall.
plant hormones: hormones that regulate the growth and development of many plants.
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placental mammals One of three groups of mammals that carry their young in the mother's body for long periods during which the fetus is nourished by the placenta. Humans are placental mammals.
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Placental mammals; those whose young complete their embryonic development within the uterus, joined to the mother by the placenta.
eutrophic lake ...
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: Placental mammals. A subclass of the Class Mammalia (others are
monotremes
and marsupials). Embryo and fetus are nourished by a placenta.
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In placental mammals, offspring are born as juveniles: complete animals with the sex organs present although non-functional. After several months or years, the sex organs develop further to maturity and the animal becomes sexually mature.
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Whales are the largest species of exclusively aquatic placental mammals, members of the order Cetacea, which also includes dolphins and porpoises. They are the largest mammals, the largest vertebrates, and the largest known animals in the world.
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This happens early in embryonic development at random in mammals, except in marsupials and in some extra-embryonic tissues of some placental mammals, in which the father's X chromosome is always deactivated.
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