Question

how do species react to the selective environment?
become nocturnal
develop new traits or behaviors
engage in predation

Explanation:

Species can adapt to selective environments by developing new traits or behaviors. Becoming nocturnal is a specific trait - related adaptation. Engaging in predation is a behavior that can be part of adapting to environmental pressures. For example, in an environment where there is intense competition for resources during the day, some species may become nocturnal to avoid competition. When there are new predators or changes in the food web, species may develop new traits (like better camouflage) or behaviors (like new foraging strategies).

Answer:

All of the options (Become Nocturnal, Develop New Traits or Behaviors, Engage in Predation) are ways species can react to the selective environment.