Problemit seems unlikely that an ovoviparous ancestor of, Ask an Expert

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Problem:

It seems unlikely that an ovoviparous ancestor of mammals long ago could have had a viviparous offspring in a sharp one-generation dividing line,

Question: What would be the gradual steps between egg birth and live birth?

Question: Are there any examples of answers to the first question today?

It seems that marsupials are a different thing altogether, not something in between egg laying and live birth (no modern mammal's ancestors aren't believed to have marsupial-style birth in their evolutionary history, right?)?

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Category:- Biology
Reference No.:- M91148916

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