What factor determines when a species is considered invasive?
a. it has positive environmental impacts.
b. it is environmentally damaging.
c. it spreads outside its native range.
d. it spreads within its natural range.

b. It is environmentally damaging.

An invasive species is a kind of living organism such as amphibian, insect, bacteria, fungus, plant or even the seeds or eggs of the organism that is not native to a region or ecosystem but introduced either accidentally or by the migration of the species in search of food, shelter, habitat and mates. The invasive species has the potential to compete with the native species, can harm the environment, and health of the human or other living species.

The invasive species spread rapidly after starving the population of native species for food, shelter and for other needs. The invasive species can affect the availability of water and can damage the quality of soil nutrients. Once it is introduced into a habitat it changes the environmental condition of that habitat adversely.

the awnser is d i think