What are the similarities and differences between the whale fossils?

Whale fossils exhibit similarities in their overall morphology, such as streamlined bodies and adaptations for aquatic life, indicating their evolution from land-dwelling ancestors. However, differences can be observed in their skeletal structures, such as the development of flippers versus limbs and varying skull shapes across different species, reflecting adaptations to diverse ecological niches. Additionally, the age of the fossils can highlight evolutionary changes over time, revealing the transition from early cetaceans to modern whales. These similarities and differences provide insight into the evolutionary history and ecological adaptations of whales.