Which of the following mammals have a cloaca?

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(A) Mammals are classified into three subclasses: $Prototheria$,$Metatheria$,and $Eutheria$.$Prototheria$ (e.g.,$Ornithorhynchus$ or platypus) are egg

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Prototheria

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(A) Mammals are classified into three subclasses: $Prototheria$,$Metatheria$,and $Eutheria$.$Prototheria$ (e.g.,$Ornithorhynchus$ or platypus) are egg-laying mammals that possess a $cloaca$,which is a common opening for the digestive,urinary,and reproductive tracts.$Metatheria$ (marsupials) and $Eutheria$ (placental mammals) do not possess a $cloaca$; instead,they have separate openings for these systems.

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