Edexcel GCSE Combined Science · 1SC0
Paper 1, Paper 2
Revise: Ecosystem Organisation and InterdependenceEnvironmental changes can affect both population size and distribution. Population size means the number of organisms; distribution means where they occur. A change can increase the population of one species while decreasing that of another, so a community does not necessarily respond as a single unit.
- Revise: Ecological Fieldwork and Population Estimates
The number of organisms of one species living in a defined area.