If the organism has no natural predators then that organism can start to overpopulate the habitat and use up valuable resources that other organisms, who DO have natural predators, need to survive and repopulate.
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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Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic.
