Question

Short note on :

Co-extinctions.

Answer 1

1. When one organism is associated with other one in an obligatory way, then, if one is extinct, the other also gets extinct. 

2. Extinction of one variety leads to loss of associate variety from the ecosystem. Such phenomena is called coextinction. 

3. Extinction of host fish causes extinction of unique parasites. 

4. Coevolved plant-pollinator also will have such a threat.