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Responsiveness: Organisms respond to changes in their immediate environment; this property is also called irritability. You move your hand away from a hot stove; your dog barks at approaching strangers; fish are scared by loud noises; and amoebas glide toward potential prey.
These examples are only a small sample of the types of stimuli that affect an organism's daily existence. Stimuli are changes in the environment, and organisms must be able to adapt, or adjust, to these changes in order to survive these conditions. Stimuli come in many forms, but are usually the result of an energy source, such as light or sound, or a natural force, such as gravity.