what is the difference between flatworms and mollusks?
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Flatworms are thin, flat, acoelomate animals that can be free-living or parasitic. Roundworms and rotifers have a more highly evolved gut than flatworms. Mollusks are coelomates with a muscular foot, a mantle, and a digestive tract with two openings.
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The main difference between Worm and Insect is that the Worm is a animal that typically has a long tube-like body and no legs and Insect is a class of invertebrates. ... Insects have 3 body segments (head, abdomen and thorax) and 6 legs with 2 antennae. Annelid worms have many segments, no legs, no antennae.
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Some defining characteristics of the phylum are that flatworms are acoelomate (they have no body cavity), triploblastic (the body has three tissue layers), and bilaterally symmetric (they have symmetric right and left sides and usually a definite head), and they have organ systems, including an excretory, digestive, ...
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The two most prominent features that distinguish roundworms from flatworms are the presence of a pseudocoelom, or partially developed body cavity, and a complete digestive tract with two openings, a mouth and an anus.
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Slugs are Gastropod molluscs, basically snails without a visible shell. Worms (earthworms) are Oligochaete Annelids. Worms are segmented, molluscs are not. ... Besides Gastropods, molluscs include Octopuses etc, clams and other small groups.
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Snails are actually born with and physically attached to their shells. A snail cannot live without its shell just as a human cannot live without bones.
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Flatworms are soft, flattened worms that have tissues and internal organ systems. They are the simplest animals to have three embryonic germ layers, bilateral symmetry, and cephalization. Why are flatworms called acoelomates? Because they do not have a hollow body cavity between the endoderm and the mesoderm.
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Snails' ancestors are one of the earliest known types of animals in the world. ... All land snails are gastropod mollusks, meaning that they belong to the same group of octopuses, which are part of the phylum Mollusca. At the same time, they are members of the class Gastropoda, which includes all snails and slugs.
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No, slugs and snails are mollusks. More specifically, they belong to the taxonomic class Gastropoda.
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Slugs and snails are not insects. In fact, they're a different type of animal altogether. Insects belong to the phylum Arthropoda, whereas slugs and snails are found in the phylum Mollusca, meaning they're more closely related to squids than most other bugs found on land.
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Flatworms are more complex than cnidarians. Cnidarians have two layers of cells, the ectoderm and the endoderm; flatworms have a middle layer called the mesoderm between the other two layers (Fig.
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The Platyhelminthes are acoelomate flatworms: their bodies are solid between the outer surface and the cavity of the digestive system. Most flatworms have a gastrovascular cavity rather than a complete digestive system; the same cavity used to bring in food is used to expel waste materials.
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A snail's shell is like a home it carries around on its back. Slugs, on the other hand, have no shell. Otherwise, snails and slugs are remarkably similar. Their only other differences are in habitat and behavior, but these differences are the result of the fact that snails have shells and slugs don't.
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No, a snail is a mollusk. A mollusk can be described as an invertebrate animal (an animal without a backbone), with a soft body usually enclosed in a shell.
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Roundworms are more cylindrical in shape and tapered to a fine point at one end. Similarly, roundworms have a rigid outer covering called a cuticle that they shed repeatedly throughout their lives and as they grow. Flatworms do not have this; their bodies, instead, are covered with cilia, hairlike growths.
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They move by contracting muscle cells or the movement of tiny hairlike structures on their body called cilia. Flatworms do not have a respiratory or circulatory system. Instead, these functions take place through the process of absorption.
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['Flatworms have no true body cavity, but they do have bilateral symmetry. ... ', 'Flatworms have an incomplete digestive system. ... ', 'Flatworms do not have a respiratory system. ... ', 'There are no blood vessels in the flatworms.']