AP BIOLOGY

Detailed explanation-1: -Behavior can also be defined as a change in the activity of an organism in response to a stimulus, an external or internal cue or combo of cues.

Detailed explanation-2: -Behavioural changes of animals mostly depend on stimulus. Stimulus is of two types, external and internal. Smell, sound, etc., are examples of external stimuli and hunger, pain, etc., are examples of internal stimuli.

Detailed explanation-3: -Animals may respond to environmental stimuli through behaviors that include hibernation, migration, defense, and courtship. As a result of cold, winter weather (stimulus) some animals will hibernate. Hibernation is a state of greatly reduced body activity, used to conserve food stored in the body.

Detailed explanation-4: -You are hungry so you eat some food. A rabbit gets scared so it runs away. You are cold so you put on a jacket. A dog is hot so lies in the shade.

Detailed explanation-5: -The ability of an organism to respond to external stimuli is called sensitivity. For example, Plants grow towards light(external stimuli) sources, and if the direction of light is changed, the plant will also change its direction of growth to accommodate for survival.