Clarias gariepinus is harmful to which organism?

Which plant entered India as a contaminant with imported wheat?

Why do alien species often become invasive when introduced into a new habitat?

Which species extinction in the last $500$ years was due to overexploitation by humans?

In the current era,$\underline{X \%}$ of all bird species and $\underline{Y \%}$ of all amphibian species in the world are facing the threat of extinction.

Which of the following are alien species introduced to India?