Phylum

INTRODUCTION Animals be eukaryotic organisms without cell walls and feed heterotrophically. Animals say a high level of tissue variousiation whereby similar cells act on collectively leading to the development of tissues and organs which drop by the wayside different parts of the proboscis to perform different functions. all in all animals adopt nervous coordination and a muscle system with diligent rejoinder to environmental stimuli. Organisms are grouped into categories that represent lines of evolutionary descent. The landed estate of animalia is divided into nine phyla: Porifera, Cnidaria, Patyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata, and Chordota. Sponges are animals of the phylum Porifera. They are cellular organisms which down bodies full of pores and channels allowing piss to circulate with them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. Sponges consent un differentiate cells that tail assembly transform into other types and which often move between the primary(prenominal) cell layers and the mesohyl in the process. Sponges do not have nervous, digestive or circulatory systems. Instead, most rely on maintaining a constant water flow through their bodies to feel food, group O and remove wastes.

Cnidaria is a phylum containing over 10,000 species of animals found just in aquatic and mostly oceanic environments. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two lay ers of epithelium that are mostly unity cel! l thick. They have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths ring by tentacles that eject cnidocytes. Both forms have a iodin orifice and body cavity that are used for digestion and respiration. many a(prenominal) cnidarian species expose colonies that are single organisms composed of medusa-like or polyp-like zooids, or both....If you call for to get a full essay, coiffe it on our website: BestEssayCheap.com

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