Humans, Seals, and bats all have an upper pair of appendages

Last updated: 8/7/2022

Humans, Seals, and bats all have an upper pair of appendages (arms) which contain a first bone projecting from a shoulder/thoracic cage called the humerus, a pair of bones called the radius and ulna following a joint with the humerous. Extending from the joint where the radius and ulna meet extend metacarpals and then phlanges (fingers). The fact that this bone arrangement is similar among these three types of mammals suggests that these features are.... Convergent/Analogous Homoplasies Homologous Reversals