Question

the ulna bone in the forelimb of a cat is homologous to the
_______ bone in the forelimb of a horse.

fill in the blank.
○ humerus

○ carpals

○ radius

○ ulna

Explanation:

Homologous structures are those that have a similar origin and structure, though they may have different functions. In the forelimbs of vertebrates like cats and horses, the ulna bone in a cat's forelimb is homologous to the ulna bone in a horse's forelimb because they share a common evolutionary origin and similar anatomical structure, even if their functional roles in the respective species' locomotion or movement differ. The other options (humerus, carpals, radius) have different structural and functional relationships or are not the homologous counterpart of the ulna in this context.

Answer:

D. ulna