From The Beast by Ben B. Lindsey and Harvey J. O’Higgins

The passage is organized primarily by means of
A.
spatial description
B.
comparison and contrast
C.
order of importance
D.
chronological order
E.
analogy

D. Chronological Order

Explanation:

The way the story is told, is in order in which the events happened. Also I took the test.

It's because their behavior is what sets them apart and makes them so unique. It's what causes them to have preys and predators as well as an impact on their food chain. All animals' behaviors impact their chance of survival (competition, mating, gathering food, marking territory, etc.)