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Vertebrates can be classified into five groups, based on their skin covering, how they reproduce, how they maintain body temperature, and characteristics of their limbs (arms and legs, or their equivalent such as wings or fins). Knowing the five classes of vertebrates and their characteristics helps you to understand more about these animals
19 June 2011
http://www.davidlnelson.md/Cazadero/FiveVertebrates.htm
19 June 2011
Have a look at this website for more details
19 June 2011
The five groups are Fish, Amphibians, Reptiles, Birds and Mammals
19 June 2011
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