Population
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This is one of the fundamental definitions for comprehending evolution.
![](/w/images/7/75/200px-School_of_reef_fish_at_Rapture_Reef%2C_French_Frigate_Shoals.jpg)
Fig. A group of squirrelfish (Holocentrus ascensionis) that are shoaling, not schooling: though swimming as a group, their speed and direction are not synchronised. [1]
A population is a group of individuals of one species that live in the same geographical area at the same time.