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2015-08-05T15:59:26+05:30
evolution tree shows every things among their creatures habits, shape , size , needs , modes , etc. humans having large shape , needs , modes, so that have 4 chambered heart and in small animals like frog , lizards , etc. are have 2 & 3 chambered heart they are not large like humans they are small in shape and  size , less modes and needs .
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