These organisms share a common ancestor with each other.
ancestry
3 bones
A batwing is an individual bat's wing, or something in the shape of a bat's wing.
seven.
homologous
Bat wings look like hands because the bones that make up the wing of a bat are essentially the same ones that make up the arm and hand of a human and are common to all land-dwelling vertebrates. The elongated finger bones are what support the wing membrane.
pterosaur wing bones.
20 bones
It shows that the organisms are somewhat related. It is evidence that they had a common ancestor.
98 it depends how old
flight