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One piece of evidence that indicates ancient mammals are related to each other and to modern whales would be:each species had traits that allowed it to survive in a particular time and place in Earth's history.
Whales are related to the even-toed hoofed mammals. Whales are most closely related to modern hippos, and should share a common ancestor with them.
No, whales are mammals, tuna are fish.
There is very little relation between sharks and whales. Sharks are an ancient primitive creature, and the whale is a modern creature who gives live birth and nurses its young. the whale is a creature which originally lived on land, then adapted to live in the ocean.
No whale are mammals.
No, whales are mammals and sharks are fish.
Both are mammals. That's it, they are not related. The walrus is a pinniped, related to seals, whales are Cetaceans, related to porpoises and dolphins.
Animals of the genus Ambulocetus are intermediaries between basal mammals and modern whales, and possibly ancestral to modern whales.
Only in the most general sense, in that both giraffes and whales are mammals.
They're both aquatic mammals for a start.
Fish
Dolphins are marine mammals that are closely related to whales and porpoises.