How do the fossils of whales provide evidence that whales have evolved over millions of years?

Answer 1

i guess they show tht whales were here millions of years ago and they show how they changed over time, when the whales changed or evovled, the fossils changed

they show that whales' ancestors were four legged mammals. modern whales inherited hip bones from their four legged ancestors.

Answer 2

Given enough time and enough accumulated changes, natural selection can create entirely new species, known as "macroevolution." It can turn dinosaurs into birds, amphibious mammals into whales and the ancestors of apes into humans.
Take the example of whales — using evolution as their guide and knowing how natural selection works, biologists knew that the transition of early whales from land to water occurred in a series of predictable steps. The evolution of the blowhole, for example, might have happened in the following way:Random genetic changes resulted in at least one whale having its nostrils placed farther back on its head. Those animals with this adaptation would have been better suited to a marine lifestyle, since they would not have had to completely surface to breathe. Such animals would have been more successful and had more offspring.
In later generations, more genetic changes occurred, moving the nose farther back on the head.
Other body parts of early whales also changed. Front legs became flippers. Back legs disappeared. Their bodies became more streamlined and they developed tail flukes to better propel themselves through water.