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Comparative Anatomy Lab One Abstract This laboratory is to understand the classification and comparison of chordates Introduction In this lab manual it shows the structure of phylum Chordata subphylum Vertebrata The objective is to observe the major body systems and track its course of evolution from the start of the system to its presence in animals alive today Also it is to discuss how these systems work together to produce life The main topic to focus in this lab is the Chordates which are group of animals that includes the vertebrates under the phylum Chordata They are united by having a notochord a hollow dorsal nerve cord pharyngeal slits an endostyle and a muscular tail extending past the anus Species Yellowfin tuna Materials Lab manual Discussion The phylum Chordata is broken down into three subphyla VertebrataUrochordata and Cephalochordata Urochordate larvae have a notochord and a nerve cord but they are lost in adulthood Cephalochordates have a notochord and a nerve cord but no vertebrae In vertebrates the notochord has been replaced by a bony vertebrae The chordates and two sister phyla the hemichordates and the echinoderms make up the deuterostomes a superphylum The extant groups of chordates and the major metozoan groups are shown in the phylogenetic tree in the lab manual
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