Need Help with these questions ASAP!!
11. Symbiotic relationships are beneficial to ecosystems because they (1 point)
A. always involve the sharing of food sources
B. allow multiple species to survive in the same ecosystem
C. allow predator-prey relationships to balance each other out
D. are a standard part of marine ecosystems but not those on land

12. A population cycle is (1 point)
A. how many of a species are in the population
B. a very rare event that is difficult to document
C. the result of varying temperatures in the ocean
D. a predictable increase and decrease in population

13. Only one species benefits in commensalism. (1 point)
A. True
B. False

14. How does overpopulation harm a species? (1 point)
A. Overpopulation often results in total extinction of a species.
B. Overpopulation of one species make all other species unable to survive.
C. There are few options for reproduction when overpopulation is an issue.
D. There will not be enough resources in the environment to support the population.

15. A generalist predator does which of the following? (1 point)
A. has no natural predators
B. can live in any ecosystem
C. feeds on many different kinds of prey.
D. depends exclusively in a single food source