Existence of marsupials in Australia and New Zealand proves

The existence of marsupials in Australia and New Zealand prove

Land of Marsupials is

Land of Marsupials is

Marsupials are found in Australia and are

Marsupials are found in Australia and are

Marsupials are found in Australia and are

Marsupials are found in Australia and are

Why are marsupials found in Australia only?

The structural adaptions observed in placental mice, in North America, are very similar in appearance to marsupial mice in Australia. It is an example of