They are dead
Pakicetus is an early ancestor of modern whales, existing around 50 million years ago, and was a land-dwelling creature resembling a large wolf with adaptations for living near water. Unlike modern whales, which are fully aquatic and have streamlined bodies, flippers, and blowholes, Pakicetus retained features for terrestrial life, such as legs and a more primitive skull structure. Over millions of years, evolutionary adaptations transformed its descendants into the fully aquatic cetaceans we know today. Thus, while Pakicetus is a crucial link in whale evolution, it is distinctly different in form and habitat from contemporary whales.
Pakicetus, an early ancestor of modern whales, was discovered in Pakistan. Fossils of this prehistoric creature were found in the Indus River basin, specifically in the region of Kachchh. Dating back to the Eocene epoch, Pakicetus provides essential insights into the evolution of cetaceans.
The first whale species is believed to be Pakicetus, which lived around 50 million years ago during the Eocene epoch. Pakicetus was a land-dwelling mammal that resembled a wolf and had adaptations for an aquatic lifestyle, marking the transition from terrestrial to fully aquatic life in whales. Over millions of years, this early ancestor evolved into modern whales through a series of significant anatomical changes, including the development of streamlined bodies and specialized adaptations for swimming.
It serves as a bit of evidence. There are millions of other bits of evidence. Without it, evolution would not be damaged, as there are so many other transitional fossils. With it, the theory is a few millionths stronger than it was.
It depends on which whales you are talking about. Different whales eat different things.
No dolphins had a different evolution from whales. Whales evolved from a footed creature similar to a hippo (no, seriously) and dolphins evolved from a footed creature a lot smaller.
convergent evolution
No, though cows and whales come from a common ancestor being the Pakicetus. Cows are "sisters" to hippos, and both of these species are "cousins" to whales. Cows, like all other ungulates, have their evolution much farther back on the evolutionary tree than whales do. Whales came from mammals that went from being terrestrial to oceanic in a matter of 8 million years. See the related link below for more info.
It is called convergent evolution. When two different animals have to adapt to the same environment (both whales and fish have to adapt to marine environments) evolution will make them start to look similar, even though they will still retain fundamental differences. For example, whales are mammals, and fish are... fish
Animals of the genus Ambulocetus are intermediaries between basal mammals and modern whales, and possibly ancestral to modern whales.
No. Baleen whales and Right whales are both different types.
No, whales are big and dolphins are small... If that's not enough of an answer I can ramble for you... is that what you want? Ok then, they are very similar in the fact that they treat their young the same, have the same basic biological makeup and are both mammals but it is relatively easy to see that they are different animals because they are not only in different species but, in different genuses' so in scientific lingo, they are about as similar as your friends housecat and a tiger.