Scientific validity is the applicability of a conclusion drawn in the context of a scientific experiment to the world at large.
Answer: DNA (happy to help)
Explanation:
Stimuli is detected by receptor cells . These stimuli are converted to electrical nerve impulses carried by sensory neurone to relay neurone where it is processed by Central Nervous System . The response is carried by the motor neurone to the effector s which are muscles or glands which reacts to the situation
