The plural form; multiple instances or types of chemosensitivity, the ability to sense and respond to chemical substances.
From chemo- + sensitive + -ity (forming nouns indicating state or quality) + -ies (plural). Built from the same roots as chemosensitive, with the plural ending indicating multiple sensitivities.
Different organisms have wildly different chemosensitivities—dogs have 300 million olfactory receptors while humans have about 6 million, which is why your dog is obsessed with that spot you can't even smell.
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