What is the interaction between two species called?

Competition is best defined as a process in which the fitness of one species (measured in terms of its '$r$',the intrinsic rate of increase) is significantly:

This is an interaction in which one species benefits and the other species is neither harmed nor benefited.

Which of the following plants produces a poisonous cardiac glycoside chemical?

Birds living in the same habitat generally differ in their niches because they . . . . . . .

In brood parasitism . . . . . . .