A limb with five digits such as a human hand or foot which are found in many amphibia, reptiles, birds and animals, which can allow us to deduce that all species in these categories derived from one common ancestor.
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Pentadactyl limbs is a common feature found in tetrapods. The class amphibian, reptile, aves (birds), and mammals fall under this superclass tetrapods. The order primates fall under the class mammalia (mammals). So primates ...
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