Which is NOT an environmental stressor?

Which is NOT an environmental stressor?

• A. Pain
• B. Humidity
• C. Odor
• D. Noise

Answer: (A)

Understanding what counts as an environmental stressor helps differentiate external factors from internal states. Environmental stressors are elements of the animal’s surroundings that can provoke a stress or fear response, such as humidity (uncomfortable moisture in the air), odors (strong or unfamiliar smells), and noise (loud or sudden sounds). Pain, however, is an internal condition—discomfort arising from injury or illness—not something in the environment. It causes stress, but it isn’t an environmental factor. You would address pain with appropriate medical care, while environmental stressors are mitigated by modifying the surroundings. So pain is not an environmental stressor, making it the correct choice.

Understanding what counts as an environmental stressor helps differentiate external factors from internal states. Environmental stressors are elements of the animal’s surroundings that can provoke a stress or fear response, such as humidity (uncomfortable moisture in the air), odors (strong or unfamiliar smells), and noise (loud or sudden sounds). Pain, however, is an internal condition—discomfort arising from injury or illness—not something in the environment. It causes stress, but it isn’t an environmental factor. You would address pain with appropriate medical care, while environmental stressors are mitigated by modifying the surroundings. So pain is not an environmental stressor, making it the correct choice.