Deer run in zigzag patterns when being chased by predators. what type of adaptation is this? a. behavioral b. physiological c. structural d. ecological

The right option is; a. Behavioral

This type of adaptation is behavioral adaptation.  

Behavioral adaptation is any action an organism (plant or animal) takes or how it behaves usually in reaction to certain external stimulus for its survival. Behavioral adaptations perform a vital role in the survival of an organism. Examples of behavioral adaptions include how an animal moves, how it may keep itself safe, or what an animal is able to feed on.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.