Of the species interactions discussed in class why

15. Of the species interactions discussed in class, why can only competition, parasitism, and
predation regulate a population’s growth? (2 points)
A. Because when competition, parasitism, and predation occur, at least one partner in the
interaction is negatively affected
B. Because mutualisms are often subject to conversion to parasitism, depending on
population density
C. Because competition, parasitism, and predation are biotic factors, but mutualism and
commensalism can be either biotic or abiotic.
16. Which of the following is FALSE about enemy-victim interactions?

17. The two most important axes for displaying the dimensions of a realized niche on a graph
are:
18. The competition experiment performed by Joe Connell on the coast of Scotland established
that the two species of barnacles ( Semibalanus and Chthamalus ) grew at different tidal levels
because …