In which of the following groups of mammals i | vedclass

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(A) The correct answer is $A$. Prototheria (subclass of Mammalia) includes primitive egg-laying mammals,such as the platypus and echidna and echidna.

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Prototheria

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(A) The correct answer is $A$. Prototheria (subclass of Mammalia) includes primitive egg-laying mammals,such as the platypus and echidna and echidna. Unlike Metatheria (marsupials) and Eutheria (placental mammals),Prototherians do not possess a true placenta for fetal development,as they reproduce by laying eggs.

In which of the following groups of mammals is the placenta absent?

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