Invertebrates. 14 pages. Has an introduction and includes a lot of information about all the subphyla of the phylum invertebrata.

INVERTEBRATES Introduction: Animalia is the largest of the five kingdom system, with e veryplace one million species. It has an complete variety of shapes, colors, and sizes. It is do up of eukaryotic, multicellular, heterotrophic organisms that be all(prenominal) aquatic or sublunary and reproduce sexually or asexually. Invertebrates argon a role of animal that micturate no backbone. They make up for ab push finished 97% of the animal kingdom. somewhat invertebrates be earthworms, butterflies, jellyfish, and giant squid. There be two kinds of invertebrates, abase and higher. start stunned invertebrates argon nevertheless butt in evolution, they are very soft and squishy and more vulnerable to predators. higher(prenominal) invertebrates are further along in evolution, they are tougher and s teetotum be considered less vulnerable. Porifera: General Characteristics: oSponges are grasp cylinders that are closed at the bottom and have an disturbance at the top called an osculum. oThe cylinder is lined with special triad cells (choanocytes) which by flogging their flagella pulls water into the loll around through pores and canals and circulates through the osculum. oSponges live a sessile lifestyle, so when discover cells pump water into wash they also screen bacteria, unicellular algae, protozoans, and bits of organic matter out of it and engulf it. Known as filter feeding. oWhile circulating water, wastes are excreted into the water as it exits the osculum.

oFor wear some sponges have swordlike skeletons made of protein fibers called spongin. Others have skeletons made of tiny, hard particles called spicules. oSponges reproduce asexually by forming small buds that break off and live seperatley. And sexually by sending sperm into pores of another sponge. Evolutionary Development: Porifera represents the least(prenominal) evolutionarily mature animals of the animal kingdom. Classes: oCalcarea they have spicules of calcium carbonate. oHexactinella They have spicules of silicon dioxide. oDemospongiae They have spongin or... If you want to get a full essay, company it on our website: Orderessay

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