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Sabrina Lam Ex 4C-Vertebrate Phyl, 4 digits on front feet is class Amphibia, Cartilage can have Jaw, Spiral Intestinal Valve is class Chondrichtheys, Dermal Scales can be Placoid Scales, Chondrichtheys example C. Ratfish, Fusiform made of Bone, More than 7 gill slits also has Slime Glands, Bone has Jaw, Reptilia example G. Bird, no scales can have exactly 7 gill slits