AP BIOLOGY

Detailed explanation-1: -The correct option is A. Stimulus. Any change in the environment to which an organism responds is called stimulus. The stimuli initiates an appropriate electrical impulse in the sensory neurons which transmits it to the brain or spinal cord.

Detailed explanation-2: -A change in an organism’s surroundings that causes the organism to react is called a stimulus (plural stimuli). An organism reacts to a stimulus with a response-an action or change in behavior. Another example is if you are cold, you shiver. The cold is the stimulus while the shivering is the response.

Detailed explanation-3: -The ability of an organism or organ to react to the stimuli is known as a response.

Detailed explanation-4: -Behavioral responses refer to how animals cope with changes in their environments. Animals may respond to environmental stimuli through behaviors that include hibernation, migration, defense, and courtship. Hibernation. ● As a result of cold, winter weather (stimulus) some animals will hibernate.