In the Arroyo Seco, the Western Toad feeds on beetles, bees, and small aquatic insects. The Bull Frog has been introduced and eats the same foods. The based on this information interaction between these two species can best be described as:

a. Parasite and Host
b. Competition
c. Predator and Prey
d. Mutualism

The based on this information interaction between these two species can best be described as COMPETITION. Correct option is B

Explanation:

Competition occurs between two species that shares the same requirements ( especially food) for survival.

Both the Western Toad and the Bull Frog has a similar niche because they require the same type of food (beetles, bees, and small aquatic insects) to survive in the environment of Arroyo Seco. Only one of the species will coexist in that environment and it's usually the survival of the fittest.

This explains the competitive exclusion principle proposed by Georgii Gause in 1934.

b is the correct answer