Any change in the environment of an organism is called___________?
Correct answer: A. Stimulus
- A. Stimulus
- B. Variation
- C. Response
- D. Reaction
Explanation
A stimulus is any detectable change in the internal or external environment, such as light, temperature, pressure, or a chemical change. Variation means a difference in characteristics, while response is the organism's reaction to the stimulus, so choosing either confuses the cause with the result.
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