AP BIOLOGY

Detailed explanation-1: -d. stimuli. Solution. The reaction to the changes between an internal or external stimulus is called behavior.

Detailed explanation-2: -A change in an organism’s environment that causes the organism to react is called a stimulus. A stimulus usually causes some kind of increase in activity, whether it’s metabolic or externally physical.

Detailed explanation-3: -Adaptation is a process of deliberate change in anticipation of or in reaction to external stimuli and stress.

Detailed explanation-4: -Anything that provokes a response in an organism is called a stimulus. A stimulus can be external, meaning it occurs outside the organism, like the sound of thunder and the flash of lightning. A stimulus can also be internal, or from within the organism itself, like thirst or hunger.