Asked in Animal LifeWorms
Are the three major phyla of worms flatworms roundworms and tube worms?
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Asked in Centipedes, Flatworms
What are three common characteristics of flatworms and roundworms?
Asked in Taxonomy
Which of the animal phyla was the first to evolve three germ layers?
Asked in Centipedes
Five characteristics shared by all worms?
biologist classify worms into three major phyla-flatworms roundworms and segmented worms Yes, that is true, but those are not characteristics! Some of their characteristics are: -A knot of nerve tissue -Sense organs -Sexual reproduction -Bilateral symmetry -Obtaining food by sucking their hosts Good luck!!!! I know science can be challenging at times!!!!!! :D
Asked in Animal Behavior
Mouth of a worm?
Worms (excepting the flatworms) are the simplest animals to have a one-way digestive tract (that is, they do not expel waste from the same hole that they eat through). Originally, the animals for whom it is taxonomically correct to call worms were all classified under the single phylum Vermes; later, they were split into three separate phyla: Platyhelminthes (planarians, or flatworms, this being the simplest of the three worm phyla) Nematoda (nematodes, or roundworms) and Annelida (annelids, or segmented worms such as earthworms and leeches; this is the most physiologically complex of the three worm phyla); over time, several new phyla have been developed. Worms are so separately classified partially because their eating habits and oral anatomy are so diverse. Many, such as earthworms, are decomposers (dirt and debris eaters); earthworms suck food into their bodies and push it down along the body using peristaltic muscular contractions. Other worms, such as leeches and many varieties or roundworm and flatworm, are parasitic. Some species of leeches can bite humans, latching on with their suckers and secreting anticoagulant to keep the blood flowing into the gullet. Roundworms have a digestive system lined with hard cuticle and often ridges; some species (the carnivorous ones) have teeth; others have a stylet that they can poke into other organisms to suck fluids out. Unlike roundworms and annelids, flatworms do not have a mouth; they absorb nutrients through their skin. However, flatworms are the simplest animals to have a specialized digestive and excretory system.
Asked in Arthropods
How do sponges mollusks cnidarians and worms fit into the arthropod category?
What is the two major phyla of plants?
Asked in Worms
Which animals fall in the same category as worms?
There are many types of worms. Three major phyla include Annelida (segmented worms), Nemertea, (ribbon or proboscis worms), Platyeilminthes (flukes) and Nematoda (roundworms or threadworms, unsegmented). Note that each of these is a phylum of its own, so the only super-grouping would be the Animal Kingdom (although flukes in particular have been a phylum, family and class).