An experiment that was conducted by Gause in the 1930s with Paramecium clearly demonstrated:

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Gause's experiment demonstrated competitive exclusion, which occurs when two species compete for the same limited resource and one species eventually outcompetes and eliminates the other. In his experiment, two strains of Paramecium were grown in a nutrient solution with a limited supply of resources, and one strain eventually outcompeted and eliminated the other. This directly supports the theory of competitive exclusion, which states that two species with identical ecological niches cannot coexist in the same habitat indefinitely.

An Experiment That Was Conducted by Gause in the 1930s