Question

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

Answer 1

The correct option is D. An homologous structure is a type of structure that is found in different animals but have similar form of arrangement. Homologous structures indicate decent from a common ancestor or same evolutionary origin. Homologous structures in two animals may not be alike in appearance or function but genetically, they came from the same structure of the last common ancestor.

Answer 2

D) homologous structures