What type of variation is observed when a shark and a whale have different tail fin shapes?

When observing the different tail fin shapes of a shark and a whale, this exemplifies variation among species. Variation among species refers to the differences that exist between distinct species, which often arise due to their adaptation to different environments and lifestyles. In this case, sharks and whales belong to different taxonomic groups, each with unique evolutionary histories and adaptations that suit their ecological niches.

Sharks are often adapted for speed and maneuverability in open water, which is reflected in the shape of their tail fins, aiding in propulsion. Conversely, whales, which are mammals, have evolved their tail fins to facilitate powerful movements through the water, necessary for their larger size and swimming patterns. This variation highlights how different species can adapt morphologically to their environments, leading to noticeable differences in their physical traits.