Over time, one group of squirrels becomes separated from another group. Due to erosion and the subsequent formation of a river,
the squirrels are unable to cross. The geographic barrier prevents breeding between the 2 groups of squirrels. Which term could be used to describe each group of squirrels? 1. Population
2. Ecosystem
3. Community
4. Species
</span><span>Allopatric speciation is were a single species has been separated so long they have both evolved slightly in different "directions" that prevent them from breeding after being reintroduced.</span>
