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https://phylumskeletalsystem.weebly.com/cnidaria.html
Jellyfish are polypoid, free-swimming members of the phylum Cnidaria. Jellyfish are invertebrates. that means they have no bones, exoskeleton, or shell to protect them. the majority of their body is made up of water. The water contributes to their physical support as they float through the water. The top of the jellyfish is known as the bell.
https://www.britannica.com/animal/cnidarian
Cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species.Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.
https://skeletalphylum.weebly.com/cnidaria.html
The name Cnidaria comes from the Greek word "cnidos," which means stinging nettle. Cnidarians are diverse and come in many shapes and sizes but there are some basic features of their anatomy that most share in common . The body wall of a cnidarian consists of three layers, an outer layer known as the epidermis, a middle layer called the ...
https://www.eolss.net/Sample-Chapters/C03/E6-71-07-01.pdf
UNESCO – EOLSS SAMPLE CHAPTERS BIOLOGICAL SCIENCE FUNDAMENTALS AND SYSTEMATICS – Vol. III - Porifera, Cnidaria, and Ctenophora - G. Bavestrello, M. Sara ©Encyclopedia of Life Support Systems (EOLSS) observation of their water currents and …
https://courses.lumenlearning.com/boundless-biology/chapter/phylum-cnidaria/
Cnidarians carry out extracellular digestion, where enzymes break down the food particles and cells lining the gastrovascular cavity absorb the nutrients. Cnidarians have an incomplete digestive system with only one opening; the gastrovascular cavity serves as both a mouth and an anus.
https://www.thoughtco.com/a-guide-to-the-cnidarians-129832
Mar 30, 2019 · Cnidarians take on two basic forms, a medusa and a polyp. The medusa form is a free-swimming structure which consists of an umbrella-shaped body (called a bell), a fringe of tentacles that hang from the edge of the bell, a mouth opening located on the underside of the bell, and a gastrovascular cavity. ...
https://manoa.hawaii.edu/exploringourfluidearth/biological/invertebrates/phylum-cnidaria
Cnidarians do have a more sophisticated sensory biology than sponges. The ability to respond to a stimulus of touch or pressure is called mechanoreception . When something touches the surface of the sea anemone, the nerve cells send impulses to the muscle cells in the body wall, the muscle cells contract, and the anemone moves.
https://study.com/academy/lesson/cnidaria-excretory-system.html
Cnidarians are aquatic animals belonging to the phylum Cnidaria that have a special type of stinging cell called cnidocytes. Depending on the species, cnidarians may eat small fish, plankton, or...
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