Rae+Mathis

Zoology Research Final **Mollusk**s are most common known for snails and slugs. They’re apart of the gastropods. The other most known mollusk are squids, octopuses, and cuttlefish. Those mollusks are apart of the cephalopod classes. Their kingdom happens to be Animalia. There are 85,000 recognized extant species. They live in freshwater and feed on algae. || || The Mollusk is the largest and most diverse phylum. Their body structure is anatomical. Mollusks are important in the environment because some shells are full of calcium for birds and other animals. They also clean the water and feed the plants in the sea. || || **Arthropods** are invertebrate animals that have an exoskeleton, segmented bodies, and jointed appendages. Members of the phylum Arthropoda meaning jointed feet are insects, arachnids, and crustaceans. There are over one million species. They range in micro plankton to a few meters long. Their internal cavity is known as hemocoel. They have an open circulatory system. Their nervous system is paired with ventral nerve cords. || || **Echinoderms** are Phylums of  Marine animals. They are found in the ocean depth (Interidial zone and abyssal zone). There are 7,000 living species, which makes them the second largest group of deuterostones. They’re the largest phylum that does not have freshwater or terrestrial representatives. They’re important biologically and geologically. Few groups live in the deep sea and their ossified skeletons are big contributions to limestone. || || **Aves** are feathered, winged, bipedal, endothermic egg laying vertebrates. There are 10,000 living species, making them the most speciose class of the tetrapod vertebrate. The aves are found in the ecosystems around the globe from the artic to Antarctic. The birds’ range in size and the largest oldest bird was recorded 150-200 million years ago (Archaeopteryx). They are a light weighted strong skeleton. The aves are important to the ecosystem because they have many sources of farming. Sources: "Aves." //wikipedia.com//. N.p., 5/5/2011. Web. 12 May 2011. . "Arthropods." //wikipedia.com//. N.p., 6/5/2011. Web. 12 May 2011. . "Echinoderms." //wikipedia.com//. N.p., 9/5/2011. Web. 12 May 2011. . "Mollusca." //wikipedia.com//. N.p., 11/5/2011. Web. 12 May 2011. .
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