A single orca can only kill a young blue whale. However a whole group of orcas can kill an adult blue whale though it would take a long time. An adult blue whale can kill an orca with a single strike of their tail.
Now, the blue whale's only predator is the orca, or killer whale (actually a type of dolphin). Almost a quarter of blue whales have scars from orca attacks, but the blue whale's size (up to 120 tonnes and 60 metres [200 ft] long, bigger than any of the dinosaurs) suggests they are difficult to kill. There is no information on how many are killed by orcas.
A blue whale has been attacked by orcas although the orcas were unable to kill the animal outright during their attack, the blue whale sustained massive wounds and probably died as a result of them shortly after the attack.
sometimes sharks fight killer whales.
No, killer whales do not typically eat other killer whales. They are known to primarily feed on fish, seals, and other marine mammals, but instances of killer whales attacking and eating other killer whales are rare and not a common behavior.
no
they will have to fight to be safe
Dolphin's are quicker swimmers, but killer whales are killer. I dunno.
yes
No, the killer whales didn't eat everything do they see...
it is possibly dolfins and other killer whales and sharks.
Killer whales & the Great White don't like each other.
Most whales cannot fight (despite the fact that they're, like, the largest mammels on Earth). But Killer Whales do fight/attack/take charge of their prey - by biting.
Killer whales will normally eat fish such as cod or they may eat sea otter they also attack other whales but the killer whale is not a whale it is a dolphin
Humpback whales don't usually attack other species of whales. Killer Whales are the only whales known to do that.