Final answer:
Morphological differences in coelom formation between mollusks and echinoderms lead to distinctions in mouth development.
Explanation:
In protostomes such as mollusks, the coelom forms within the mesoderm. In deuterostomes such as echinoderms, the coelom forms from a pouch of endoderm. The formation of the mouth differs in these two groups of animals due to this developmental distinction.
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