is/are defined as a group of potentially breeding organisms within a species in a given space and time.

Population.

Explanation:

Population may be defined as the smallest unit of ecology and the evolution might occur at the population level.

Population is the group of the organisms that belong to the particular species and lives in a specific particular habitat. The individual of the population breeds among themselves. Sometimes the individual of two different population can also breed among themselves in extreme cases.

Thus, the answer is population.

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