1) Explain what is meant by the ecological term population?
- Number of organisms of one species in a habitat in the same place at the same time
2) The student closed the tap. After thirty minutes the drop of coloured liquid had moved to the left. Explain why the drop of coloured liquid moved to the left.
- o2 used by wood louse
- Potassium hydroxide absorbed co2
- Decrease in pressure
3) Succession occurs in natural ecosystems. Describe and explain how succession occurs.
- Colonisation by pioneer species
- Change in environment
- Enables other…