Comparing Three Different Classes of Vertebrates

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Introduction Chordates are an animal phylum that is classified by four main characteristics that they all obtain over the course of their lifespans. The first characteristic is the pharyngeal slits, which can be found in non-vertebrates, allow substances to enter and exit (Speer 2000). The dorsal nerve cord serves as a connection between the brain and other muscles (Speer 2000). The notochord can be found below the nerve cord and acts as a support system (Speer 2000). Finally, the post-anal tail comes out from the body from the opening of the anus (Speer 2000). One major characteristic that distinguishes Vertebrates from invertebrates is the backbone that is present in their bodies. Vertebrates also have two pair of appendages and have bilateral symmetry (Adojaan 2005). Along with a fully developed organ system, Vertebrates have a central and peripheral nervous system and a closed circulatory system (Adojaan 2005). This lab report compares Amphibia, Reptilia, and Mammalia in order to outline the similarities and differences between the many vertebrate classes. By comparing and contrasting theses classes, a further understanding and knowledge of Vertebrates can be gained. Part A Class Amphibia, more commonly known as amphibians, have several features that set them apart as a unique Class. Organisms found within the Class Amphibia are cold-blooded and have very smooth skin (Prakash 2014). Amphibians can be found on both land and water, which is necessary in order to keep
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