Were blue whales alive when the dinosaurs were alive?

Answer 1

It's not likely, but it's possible they could be descendants of dinosaurs. For instance, most of today's lizards and birds are descendants of dinosaurs. There were also dinosaurs who lived in the waters, like whales do today, and they were very big. So yes, whales might be descendants of dinosaurs, but are technically not dinosaurs themselves because seemingly all dinosaurs became extinct a long time ago.

Answer 2

Yes, the seas were full of sharks during the Mesozoic Era. Sharks evolved millions of years before the dinosaurs did and have been abundant, essentially unchanged, ever since. There have been some minor modifications to their body forms and almost certainly there have been physiological alterations as well, but overall, they look and apparently acted pretty much then as they do now.

Probably the major difference is that today, the larger sharks are at the top of the marine food chain whereas during the Mesozoic Era there were some enormous marine reptiles - Ichthyosaurs, Plesiosaurs, and huge Varanids called Mosasaurs - that would almost certainly have occupied that spot then...and probably would have included the sharks, large and small, in their diets.

Answer 3

No blue whales came at 65,000 bc but megalodons where there and killer whales plus sperm whales nothing else not even the great white shark