OpenStudy (anonymous):
Which chordate characteristic is visible on the outside of an adult cat?
OpenStudy (aaronq):
"Five characteristics of Chordates 1. Single, hollow nerve cord beneath dorsal surface; in vertebrates, it differentiates into brain and spinal cord 2. Notochord: flexible rod on the dorsal side of gut, present at one stage in all chordates; displaced in vertebrates by vertebral column that forms around the nerve cord 3. Pharyngeal slits (pouches) connect pharynx (between mouth and esophagus) with outside ? gills in sharks, fish; present in terrestrial animal embryos but disappear later except Eustachian tube (connecting throat and middle ear) 4.\( \sf Postanal ~tail \) extends beyond anus; present at least in embryo; regresses into tail bone in humans 5. Segmentation: reflected in arrangement of muscles (somites) and in vertebral column (both mesoderm)" http://www.jochemnet.de/fiu/BSC1011/BSC1011_16/sld002.htm
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