Is a structure or behavior that helps living thing meet its needs for survival an adoption?

The correct term is "adaptation". An adaptation is a structure or behavior that has evolved over time to help a living thing survive and reproduce in its environment. Adaptations can include physical features, such as the long neck of a giraffe that allows it to reach leaves in tall trees, or behavioral traits, such as the migration of birds to warmer climates during the winter. Adaptations can also include physiological changes, such as the ability of some plants to store water in their leaves to survive in dry environments.