The primary cause of biodiversity loss is .....

Most of the endangered species are the victims of

The number of wildlife is continuously decreasing. What is the main reason for this?

One of the chief reasons among the following for the depletion in the number of species making it endangered is

Which of the following statements is correct regarding Parthenium (Carrot grass)?
$(a)$ It was introduced into India as a contaminant with imported wheat.
$(b)$ It causes allergies.
$(c)$ Asexual reproduction occurs in its flower.

Due to the colonization of tropical Pacific islands by humans,more than $............$ species of native birds became extinct.