The answer is An object is in motion if it changes position relative to a reference point. You assume that the reference point is stationary, or not moving.
The answer is a person removes their hand after touching a hot stove and a person turns their head toward the source of loud noise.
External stimuli are factors outside of the body that is taken in by receptors and will lead to a response. Examples of external stimuli include temperature changes, vision, hearing, tasting, smelling, and even sunlight for plants.
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The four have molecular similarities, but have their own unique traits.
