Why are there so many more marsupial species in Australia compared to other continents?
In: 17
Because Australia was geographically isolated from the rest of the world since before placental mammals outcompeted marsupials in other parts of the world (like in the Americas). So it’s not a case of “there’s so many”, because they were the only mammals present there in the first place and just filled all the normal niches, but rather “they survived so long”.
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