__________ are odourless chemicals that serve as social signals to members of one's species.

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Pheromones are chemicals that are used as social signals to members of one's own species. They are used for various purposes such as attracting mates, marking territories, and indicating food sources. Rhodopsins are visual pigments found in the retina, photopigments are also visual pigments and papillae are taste buds.

__________ Are Odourless Chemicals That Serve as Social Signals to Members