What you'll learn
How life evolves and why biodiversity matters.
Key ideas
- Natural selection (Darwin) and evidence from fossils.
- Biodiversity, extinction and conservation.
- Feeding relationships and decomposers.
Exam tips
- Explain natural selection in ordered steps.
- Give reasons biodiversity is valuable.
Common mistakes
- Saying organisms 'choose' to adapt.
- Ignoring the role of variation.