Question

What is the difference between an introduced and an invasive species?

a) An introduced species is new to the ecosystem; an invasive species has been there a long time.
b) An introduced species is brought in on purpose; an invasive species is brought in by accident.
c) An introduced species is not necessarily harmful to the environment; an invasive species has a negative effect.
d) An introduced species is added in by humans; an invasive species enters new ecosystems on its own.
An introduced species is added in by humans; an invasive species enters new ecosystems on its own.

Answer 1

Answer is C) An introduced species is not necessarily harmful to the environment; an invasive species has a negative effect.
Because

Introduced species: any
organism that was brought
to an ecosystem as the
result of human actions

Invasive species: A species that takes
advantage of an unoccupied
niche, or that successfully
out-competes native
species.