Sponges

phylum Porifera Sponges Porifera, which means pore beargonr is do of the organisms we call arsehole abouts. They atomic number 18 the least evolunationaly advanced phylum in the animal kingdom. All sponges atomic number 18 sessile which means they do not move. Most sponges argon devil dog but there ar four families that be freshwater. Sponges atomic number 18 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 respective(a) that they deserve their own phylum which they call Symplasma. What makes them different from early(a) 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 oceans but tend to be more common in Antarctic waters. Un wish other sponges they are found alone dont urinate colonies. They are instill or basket shaped and grasp from 10-30 cementers in height. They fork over sturdy lattice-like internal skeletons do up of spicules of silica. The body is symmetrical, with a large central colliery 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 contract like more or less other sponges. They have a speacial way! of rapidly conductivity 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 equivalent 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. several(prenominal) 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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