Due to continental drift, the South American mammals were overdden by

Due to continental drift, the South American mammals were overidden by

Due to continental drift, the South American mammals were over ridden by

Assertion : Due to continental drift, when South America joined North America, North American animals were overridden by South American fauna. Reason : Due to the same continental drift, placental mammals of Australia survival because of lack of competition from any other mammal.

Assertion :- Due to continental drift pouched mammals of Australia survived. Reason :- There is lack of competition from any other mammal.