The wing of a bird and the leg of a horse are very different looking structures. although they look different, bird wings and horse legs are very similar in the arrangement of the bones that make up the limb. which term is used by scientists to describe structures that look different on the outside but are actually similar in construction and develop from the same embryonic tissues?
a) common descent
b) ancillary anatomy
c) vestigial structures
d) homologous structures