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Mollusks represent the second largest phylum in the animal kingdom, encompassing marine, freshwater, and terrestrial species. This diverse group is defined by key characteristics such as a true coelom, where organs are suspended in a fluid-filled body cavity for cushioning. Mollusks also undergo a trochophore larval stage, allowing them to swim freely using cilia. With seven distinct classes, these creatures display a remarkable range of forms and adaptations, highlighting their ecological significance and evolutionary success.
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