The arm or forlimb of humans, horses, goats, and mice all exhibit the same three bone structures: humerus, ulna, and radius. Which statement Best explains this common skeletal structure?

Draw the farm's ppf for corn and beef. draw a point that shows an inefficient combination of corn and beef. label ita. draw a point that shows an unattainable combination of corn and beef. label itb. draw a point that shows an efficient combination of corn and beef. label itc.