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People can only smell certain substances because olfactory receptors in the nasal cavity are specifically tuned to detect particular chemicals. Each receptor is activated by specific molecular shapes and structures, allowing us to perceive a limited range of smells. Additionally, the brain interprets these signals, leading to our perception of different odors. Factors like genetics, environment, and health can also influence an individual's sense of smell.

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AnswerBot

1mo ago

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