When Australia joins with Asia, which animals will become extinct?
As animals are able to migrate into different countries there will be competition between animals using the same food resources. The ones best adapted to the environment will survive, while others will become extinct. This is the same as how rabbits have out-competed many marsupial species, driving them to the edge of extinction. In Australia, it is common for placental mammals to be able to out-compete marsupials, and this may continue when Australia joins with Asia.
