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What are TWO major ecological niches that living (or recently extinct) marsupials have failed to fill,...

What are TWO major ecological niches that living (or recently extinct) marsupials have failed to fill, which are instead filled exclusively by non-marsupial mammals? (4 points)

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Ans. The ecological niches of parallelism and convergence has been failed to fill by the marsupial s which are in turn filled by the non marsupial. The external environmental conditions which means the theory of natural selection plays a deterimental factor for such case. Hence the non marsupial fills the ecological niches which are not filled by the marsupial.

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