Why are nonnative species a threat to biodiversity?
why are nonnative species a threat to biodiversity?

a. they often use up resources that other organisms need.
b. they are not able to successfully breed in the wild.
c. they release pollution into many environments.
d. they easily contract and spread diseases to other organisms.

They easily contract and spread diseases to other organisms.

A.They often use up resources that other organisms need.

Explanation:

A nonnative species is the one which is either intentionally or accidentally introduced into a new habitat. This species is capable of competing with the native species for resources like water, food and mates. This may result in the decline of the native species due to mortality of the members of the native species, migration and extinction. Therefore, the biodiversity of the region will decrease.