Various types of Australian marsupials have often been compared with similar types of placentals (e.g., gliding squirrels and gliding possums) as examples of convergent evolution
However, there is no equivalent among marsupials to a placental whale or even to a seal. What is a possible reason for this?
As marsupial young complete their development in the pouch, prolonged submergence would cause them to drown. Additionally, giving birth underwater (like a whale) would be impossible because the tiny neonate would be swept away.
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Fill in the blank(s) with correct word
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