They have blowholes.
Dolphins and porpoises are actually small whales and are related to whales.
blue whales
whales
Baleen whales eat krill and other plankton, which they strain from the water. Some toothed whales eat fish and squid. "Killer whales" (which are Orca and not whales) eat walruses and seals.
Every living thing except for plants are creatures. So yes whales are a creature.
just like any other creature they do it overtime. the giant tail and large fins are an example of adaptation
Whales, porpoises and dolphins are all cetaceans.
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.
whales are the ones that have a horizontal tail with all the sea mammals. sharks and every sea creature has a vertical tail for every sea creature that breaths with the gillsilts.
Sharks! (some) Whales! Dolphins!
krill
Dolphins and whales are mammals, as well as manatees and otters.