2. which of the following would be a reason for a species to undergo cyclic population changes? (1 point)

the keystone species in its ecosystem is removed.
the vegetation it eats increases and then decreases repeatedly with changing seasons.
its predator is preyed upon by a new species introduced to the ecosystem.
climate change alters the prevalence of parasites that affect the species.

3. panthers and pumas prey on a type of deer in a region. the deer feed on vegetation in the region. what
outcome could occur if the panthers and pumas are killed by humans? (1 point)\

the deer population will decrease, allowing the vegetation to become overgrown.
the deer population will increase, and will strip the region of the vegetation.
the deer population will be stabilized by the local vegetation.
the deer population will cycle between high and low numbers until a new predator moves
into the region.
4. which of the following is expected to occur if a keystone species is removed from an ecosystem?
(1 point)

a niche is eliminated.
competition is reduced.
other species move toward stable populations.
the ecosystem collapses