The diagram below shows the skeletal forearms of different species. Although the functions are different what evidence of evolution is depicted?

Due to the presence of different structure of forearms.

Explanation:

The evidence of evolution is depicted in the diagram due to the presence of different forearms of different organisms. The ancestor of all organisms are the same, but due to change in the environment changes occurs in the body structure of organism especially in the skeletal structure. This change in the structure requires millions of year to occur so that's why different organisms have different skeletal forearms.

it would be c. xylem.