all placental mammals like us. But there are two other groups. One of those groups is the monotremes. These are mammals that still lay eggs. They are very primitive mammals. And these arethe platypus and the echidna species of mostly Australia. So in looking at them, it's not that the ancestors of mammals would have looked exactly like them. They're specialized in their own way,but in looking at them, we get a glimpse of this time when mammals still lay eggs. The third group are the marsupials. And these are ones that are very common in South America and in Australia.
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Definitions of “platy”
noun
Like a plate; consisting of plates.
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