Adaptation is a biologic mechanism or characteristic by which adjust to changes on the environment or to new environments. Therefore, its definition is B) Structural or behavioral characteristics favored in a particular environment.
Endangered species are species that are in danger, at risk of extinction. Therefore, its definition is A) A species that is at risk of extinction.
Evolution refers to changes and adaptations in a population over several generations. Therefore, its definition is C) Change in a population over time
Extinction refers to when all of the individuals of a species died, and the species no longer exist. Therefore, its definition is D) Death of all members of a species