_____ are odorless chemical signals that are not readily noticed by the nose but are detected in the environment.

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Pheromones are chemical signals that are not easily detected by the human nose but are detected by animals of the same species, often used for communication and attraction. Hormones are chemical signals produced by glands in the body that regulate various physiological functions. Neurotransmitters are chemical messengers in the nervous system that transmit signals between neurons. Enzymes are proteins that catalyze chemical reactions. Endorphins are neurotransmitters that regulate pain and pleasure in the brain.

_____ Are Odorless Chemical Signals That Are Not Readily Noticed