Answer:
The presence of the same two bones, the radius and ulna, in the forelimbs of both humans and whales is an example of convergent evolution. Convergent evolution occurs when unrelated or distantly related species independently evolve similar traits or features in response to similar environmental or functional challenges.
In the case of the radius and ulna in the forelimbs of humans and whales, both species adapted to similar functions despite their distant evolutionary histories. Both humans and whales are mammals that evolved from different ancestors, and their forelimbs have undergone different evolutionary pathways.
In both cases, the forelimbs are used for movement and locomotion, and having two long bones (radius and ulna) that run parallel to each other allows for greater flexibility and control. This structure provides support for the forelimbs and enables them to perform a wide range of movements, whether it's swimming for whales or various actions for humans.
While the common function of the forelimbs in humans and whales led to the evolution of similar bone structures, it is important to note that the rest of their anatomies are quite different due to their unique evolutionary histories and adaptations to their respective environments. Convergent evolution is a fascinating example of how nature can arrive at similar solutions to challenges posed by the environment or lifestyle, even in species that are not closely related.
Step-by-step explanation: