Snails have two pairs of tentacles. Describe the difference between the two and explain the function of each.

The tentacles on snails are sensory organs, they use them to feel around their environment, that largest pair (or only pair on certain species) have light-sensitive patches on them, either at the tip or at the base. There are also olfactory sense cells, or their sense of smell cells, on the tentacles.

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Explanation:

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.