Species exist as one or more populations
A species can live as a single group in one place, or as several separate groups spread across different locations. Each of these groups is called a population.
Real World
The red squirrel in the UK survives as several isolated populations — one on the Isle of Wight, another in the Scottish Highlands — separated by habitat loss and competition from grey squirrels.
Exam Focus
Define 'population' precisely using all three criteria (same species, same place, same time) whenever a question asks you to distinguish it from 'species'.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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