The description that best fits the definition of behavior is how an organism responds to internal and external stimuli. Thus, the correct option is A.
A behavior may be defined as the observable response of an organism in response to numerous external or internal stimuli.
The organisms may possess some behaviors that are directly inherited from their parents. These behaviors are known as innate or inborn behaviors. while some are learned behavior. Some are mixed in nature.
Therefore, the description that best fits the definition of behavior is how an organism responds to internal and external stimuli. Thus, the correct option is A.
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