No. Elephants are land mammals, and whales live in seas and oceans, so they would have no reason to compete against each other.
Employers compete with each other for employees, and employees compete with each other for good jobs.
They compete with each other in the farming industry due to arable land.
by using the prices to compete with each other
He was unable to compete because of the injury. They decided to compete against each other.
By crowding each other.
no
food
they poo
Yes; I don't expect they attack each other.
herds of elephant take care of each other
25 athletes compete against each other in Olumpic swimming
They rarely have to as they almost never meet each other and they usually prey on different animals, though if a killer whale thought it could eat a polar bear and attacked, the bear would probably head towards dry land(not ice floes!) and wait there.