Susceptibility to extinction is due to
Decline in the population of indian native fishes due to introduction of Clarias gariepinus in river Yamuna can be categoriesd as
The region of biosphere reserve which is legally protected and where no human activity is allowed is known as
Biosphere reserves differ from National parks and Wildlife sanctuaries because in the former
$A$ : Process of extinction is random and fast.
$R$ : Any species not adapted to environmental conditions cannot survive.