Number of red list categories prepared by $WCU\; (IUCN)$ is
$6$
$7$
$8$
$9$
If the Bengal tiger becomes extinct
Ranthambor national park is situated in
More than $70\; \%$ of world's freshwater is contained in
As estimated by Robert May, what is total number of species present on earth?
The dolphin found in Chilka lake is