Which principle states that two species in the same habitat cannot have the same niche?

The question says,'which principle states that two species in the same habitat can not have the same niche? The principle is called competitive exclusion principle. It tates that two species that compete for exactly the same resources can not coexist stably. One specie will outcompete the other specie, which will be eliminated.

The conclusion is that the jellyfish like the clarinet the most and the but i don’t know 25