Are eutharian mammals oviparous or vivi parous
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animals whick lay eggs are oviparous
mammals whic give birth to young y=ones are viviparous
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Hypothesis for the origin of eutherian mammals. Additional evolutionary implications to being an early eutherian. Living mammals are ordered into three easily-defined major groups, the oviparous monotremes, the ovoviviparous marsupials (the 'pouched mammals'), and the viviparous eutherians ('placentals').
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