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The wriggling movement of roundworms is a result of the fact that they do not have circular muscles, however, they do have lengthwise muscles. Roundworms are also known as nematodes.

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Hal Keebler

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4y ago

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What is wriggling movement?

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Mollusks possess several features that contribute to their complexity compared to roundworms, flatworms, and corals. They have a well-developed coelom, a muscular foot for movement, and often possess a mantle that secretes a shell. Additionally, mollusks typically have a more intricate nervous system, including a centralized brain and specialized sensory organs, as well as a complex digestive system with a radula for feeding. These characteristics enable greater adaptability and ecological diversity among mollusks.


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