Question

find out in the past if there were some biotic and abiotic factors in the ecosystem you have selected but now they are not found if this is the situation find out the reason for their demonetisation

Answer 1

I think there are no such in abiotic. But in biotic the dinosorous species have been extincted. And some species who are not able to reproduce further generation they get extinct..
And Some are extincted because of some natural disasters or man made disaster.. And the Man had been hunting animals like Tiger and Lion. And if this continues they will be extincted..