Question

Many species of organisms are found only on islands. Lemurs are found only on Madagascar and koalas only on Australia. Which factor contributes MOST to this situation?

Answer 1

This is because of Restricted Distribution of species. Parts separated from the main land(say Australia) has unique flora and fauna. As a result of restricted distribution there are low rates of migration and significant isolation by distance, supporting the restricted gene flow.

For example-

1) Egg laying mammals, Pouched mammals are found only in Australia.

2) Birds in Galapogas Island.

Answer 2

Answer:

This is because of Restricted Distribution of species. Parts separated from the main land(say Australia) has unique flora and fauna. As a result of restricted distribution there are low rates of migration and significant isolation by distance, supporting the restricted gene flow.

For example-

1) Egg laying mammals, Pouched mammals are found only in Australia.

2) Birds in Galapogas Island.

Explanation: