The exotic species $Eichhornia \text{ } crassipes$:

Of the four major causes for the loss of biodiversity (Alien species invasion,habitat loss and fragmentation,over-exploitation,and co-extinctions),which according to you is the major cause for the loss of biodiversity? Give reasons in support.

Which one of the following is $NOT$ one of the 'Evil Quartet' responsible for the loss of biodiversity?

Select the appropriate option regarding the term 'The Evil Quartet'.

When a host fish species becomes extinct,its unique assemblage of parasites also meets the same fate. This is an example of:

Which animal has recently become extinct?