organic biolgoy
2006-12-10 15:26:11 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Pisces, Amphibia, Reptilia, Aves, Mammalia. These are the five classes of Vertebrata.
Pisces have gills, scales and glands on skin, swim bladder, two-chambered heart.
Amphibians have scaleless, glandular skin, lungs in the adult for respiration, three-chambered heart.
Reptiles have scaly,dry skin, in heart ventricle is incompletely divided except in crocodiles where ventricle is totally divided into left and right chambers.
Aves have feathers, no teeth, four-chambered heart, air sacs, hollow bones, warmbloodedness, only right systemic arch.
Mammalia have hair, mammary glands, dentition thecodont, heterodont, diphyodont; presence of diaphragm, seven cervical vertebra, scrotum in the male, RBC without nucleus, only left systemic arch.
2006-12-10 16:18:14 · answer #1 · answered by Ishan26 7 · 0⤊ 0⤋
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2006-12-10 15:29:06 · answer #2 · answered by lori b 2 · 0⤊ 0⤋