Difference between prototheria metatheria and eutheria
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The mammals are defined are hairy quardrupeds. Their name refers to the milk secreting mammary glands in the females for sucking the young for sometimes after birth. The mammals have evolved from the mammals like reptiles like Dimetrodon in Triassic some 200 million years ago in the Jurassic period, before the first birds. There are 5000 species of living mammals known.
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The oldest infraclass of therian mammals is the Metatheria , or the marsupials .
☛ Their young are born very immature and cannot live without further development in the mother's pouch. ...
☛ Most mammal species, including humans, are in the infraclass Eutheria . They are also referred to as placental mammals
☛ Their young are born very immature and cannot live without further development in the mother's pouch. ...
☛ Most mammal species, including humans, are in the infraclass Eutheria . They are also referred to as placental mammals
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