Living organisms form communities. It is important to understand the relationships within and between these communities. These relationshipss can be influced by exteral factors. Physical factors that may affect the distribution of organisms are:
- Temperature - for example, artic plants are small which limits the number of plant eaters which can survive in the area.
- Availability of nutrients - most plants struggle to grow when mineral ions are in short supply and again few animals will survive in taht area.