what are the common characteristics of the bodies of all worms?
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Characteristics. All worms are bilaterally symmetrical, meaning that the two sides of their bodies are identical. They lack scales and true limbs, though they may have appendages such as fins and bristles. Many worms have sense organs to detect chemical changes in their environments, and some have light-sensing organs.
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Most internal parasites are worms and single-celled organisms that can exist in the intestines of dogs or cats. The most common worms are roundworms, hookworms, whipworms and tapeworms. Common single-cell parasites are coccidia and Giardia.
891787
They have simple digestive systems, with mouths to take in food and long digestive tracts to diffuse it around the body. Most flatworms take in food via their mouth, then move it into a digestive gut that attaches to the digestive structures.
256678
Like flatworms, annelids have a mesoderm with muscle, a central nervous system, and an excretory system. ... In addition to a more specialized complete digestive system, annelid worms have also evolved body features not found in flatworms or nematodes.
199975
Intestinal worms, or parasitic worms, are simple organisms that feed off the human body. Many people recognize the more common varieties, such as tapeworms and hookworms, but may be less aware of the others.
426625
['Unlike the flatworms, the roundworms have a body cavity with internal organs.', 'A roundworm has a complete digestive system, which includes both a mouth and an anus. ... ', 'Roundworms also have a simple nervous system with a primitive brain.']
283198
['Radially Symmetrical.', 'Body multicellular, few tissues, some organelles.', 'Body contains an internal cavity and a mouth.', 'Two different forms exist, medusa and polyp.', 'Reproduction is asexual or sexual.', 'Has a simple net like nervous system.', 'Has a distinct larval stage which is planktonic.']
1309532
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.
544615
['A hard exoskeleton made of calcium - no internal skeleton.', 'The head has two compound eyes, two pairs of antennae, and three pairs of mouthparts.', 'A pair of green glands excrete wastes near the base of antennae.', 'The abdominal segments have swimmerets (swimming legs)']
586067
Parasitic flatworms have various adaptations to optimize their survival inside the host body. They protect themselves from the digestive juices of the host by developing protective teguments or covering around their body. They have various organs of adhesion like hooks and suckers.
1394432
Characteristics of Mollusks Their bodies are made up of three main parts, including a muscular foot, a visceral mass, and a mantle. The foot is an appendage that some mollusks use for movement and others use for burrowing. The visceral mass is the inner part of the mollusk that contains their vital organs.
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['They are bilaterally symmetrical and triploblastic.', 'Chordates are coelomate and show an organ system level of organisation.', 'They have the characteristic notochord, dorsal nerve cord, pharyngeal slits.', 'Also, they have a post-anal.']
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[' Symmetry of the body.', ' The structure of the body cavity.', ' The segmentation of the body plan.', ' External appendages that are used for sensing, chewing, locomotion, mating, and other functions.', ' The development of a Nervous System.']
12008
['Endoskeleton made mostly of bone.', 'skin is smooth with many capillaries and pigments, no scales.', 'usually two pairs of limbs with webbed feet.', 'as many as four organs of respiration.', 'a three chambered heart.', 'Oviparious with external fertilization.']
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Roundworm Adaptations Roundworms have a round body because they have a partial fluid-filled body cavity (pseudocoelom). This is one way that roundworms differ from flatworms. Another way is their complete digestive system. It allows them to eat, digest food, and eliminate wastes all at the same time.
182516
['Symmetry and Size. Annelids are all bilaterally symmetrical animals. ... ', 'Coelom. ... ', 'Body wall. ... ', 'Parapodia. ... ', 'Nervous system. ... ', 'Sense organs. ... ', 'Circulation and respiratory structures. ... ', 'Segmental organs.']
1181
['A segmented body (Figure below) with a head, a thorax, and abdomen segments.', 'Appendages on at least one segment. ... ', 'A nervous system.', 'A hard exoskeleton made of chitin, which gives them physical protection and resistance to drying out.']