Which is an example of a response to a stimulus? A. the presence of allergens in the air B. an increasing heart rate when blood oxygen levels drop C. the thick fur on an animal to protect it from cold weather D. loss of water from the body as a result of excess sweating
@Smita12
its B
B. Your heart is reacting to the stimulus of dropping oxygen levels. C is not the answer because the thick fur is an adaptation that is always with the animal, so it's not a reaction to a stimulus. Nor will the fur suddenly become thicker if the animal is put in a giant freezer, and then thinner again when the animal is taken out. A reaction would be the fur fluffing up in cold weather (like getting goosebumps). D is simply the result of an action. A could *cause* a reaction, since allergens stimulate some sort of reaction in people. But allergens on their own are nothing.
okay so its b
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