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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 correct answer is Competitive exclusion principle.

Competitive exclusion is the principle which states that two species in the same habitat cannot have the same niche.
When one species has little advantage over the other, the one with little advantage will be able to dominate in the long term. 
It is attributed to the Georgia Gause.

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