Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis?

Similarities in Anatomy: Dolphins and whales share similar physical characteristics, such as streamlined bodies, flippers, and tail flukes, which are adaptations for life in water. This suggests they may have evolved from a common ancestor.

Vestigial Structures: Both dolphins and whales have vestigial structures, such as tiny, non-functioning pelvic bones and leg bones, which are remnants of their land-dwelling ancestors. This supports the idea that they evolved from a common terrestrial ancestor.

DNA Analysis: Genetic studies have shown that dolphins and whales share a significant amount of DNA, indicating a close evolutionary relationship.

Fossil Evidence: Paleontologists have discovered fossils of ancient cetaceans (the group that includes dolphins and whales) that had characteristics of both land and sea animals, suggesting a transition from land to sea.

Similarities in Behavior: Dolphins and whales exhibit similar behaviors such as complex social structures, communication systems, and echolocation abilities, which could be indicative of a common ancestry.

Evolutionary Biology: The study of evolution suggests that species with similar environments and lifestyles, like dolphins and whales, often have a common ancestor. This is known as convergent evolution.

Embryological Evidence: The embryos of dolphins and whales show similarities during certain stages of development, which is often a sign of common ancestry.