In his experiments with different competing pairs of Paramecium species, Gause found that sometimes both species persisted and sometimes only one species did. Which hypothesis did Gause propose in order to explain the cases in which both species persisted?

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Gause proposed that when both species persisted, it was because they tended to use different resources, allowing them to coexist without directly competing for the same resources. This is known as resource partitioning.

In His Experiments with Different Competing Pairs of Paramecium Species