Why is it difficult to distinguish between the organs of smell and the organs of taste in low-organized animals

Why is it difficult to distinguish between the organs of smell and the organs of taste in low-organized animals, for example, small-bristled worms?

Because the receptors of both organs are affected by chemicals that are soluble in water and in direct contact with the receptors. Differentiation of these sense organs begins only in animals that have emerged on land (arthropods).

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