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Answer: Their tongue
Snakes use their tongue and a sensory organ to smell. Snakes essentially smell by using their forked tongue to pick up scent particles in the environment. Then, the snake brings its tongue back into its mouth where it makes contact with the Jacobson’s organ.
When these scent particles make contact with the Jacobson’s organ, it essentially sends a signal to the brain to interpret. From there, the snake is able to know if these scent particles are from food, a threat, or from its environment.
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