today was about observing the similarities in the forelimbs of different organisms, to be specific.. the pentadactyl limb. these similar bone structures suggest that these animals evolved from a common ancestor, but adapting to suit their environment.
generally it consisted of a humerus, an ulna and radius, a carpal and 5 digits (fingers/toes, etc)
mammals, birds, reptiles and amphibians share this common feature.
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