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This final lesson in the Inheritance, Variation and Ecology module covers biodiversity, the impact of human activities on ecosystems, and how food production can be made more sustainable. These are key topics in the AQA GCSE Combined Science Trilogy specification (8464).
Biodiversity is the variety of all the different species of organisms on Earth, or within an ecosystem. High biodiversity means a wide range of different species.
| Reason | Explanation |
|---|---|
| Ecosystem stability | More species means more food web connections, making ecosystems more resilient to change |
| Food security | Humans depend on diverse crops and livestock for food |
| Medicine | Many medicines come from plants and animals (e.g. aspirin from willow bark) |
| Genetic resources | Wild relatives of crops contain useful alleles for breeding resistant varieties |
| Ecosystem services | Pollination, water purification, soil formation all depend on biodiversity |
| Ethical responsibility | Many argue that all species have a right to exist |
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