Sponges

phylum Porifera Sponges Porifera, which means pore beargonr is do of the organisms we call bottom of the inning abouts. They atomic number 18 the least evolunationaly advanced phylum in the animal kingdom. All sponges atomic number 18 stalkless which means they do not move. Most sponges argon nautical but there argon four families that be freshwater. Sponges are classified into 3 classes. Hexactinellid sponges or Glass sponges are a relatively un car park. These sponges are usually classified in the phylum Porifera, but some scientist think there so associate that they deserve their own phylum which they call Symplasma. What makes them different from other sponges is their skeleton, do of four- and/or six-pointed siliceous spicules. Glass sponges seem too in the first place to be comprise in depths from 450-900 meters. there found in all the ocean s but tend to be more common in Antarctic waters. Un wish other sponges they are found alone dont bound colonies. They are instill or basket shaped and cuckold from 10-30 cementers in height. They fork over sturdy lattice-like internal skeletons make up of spicules of silica. The body is symmetrical, with a large central tooth decay that opens to the outside through a sieve formed from the skeleton.

They are mainly pale in color. The body is mainly do of syncitia. Instead of having epidermal cells like other sponges they micturate a syncitial net of amoebocytes that the spicules penetrate. They are futile to c ontract like nearly other sponges. They hav! e a speacial way of rapidly conduction rapid impulses though their bodies. Demosponges are the largest class in the Porifera phylum. There skeletons are made of spicules made of the protein spongin. They are akin(predicate) to glass sponges but they have a different shape. 90% of sponges are considred demosponges and have the leuconoid sponge structure. They mostly live in marine environments but are sometimes found is freshwater. round species are brightly bleached while some are pale....If you want to get a full essay, order it on our website: BestEssayCheap.com

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