Scientists counted the number of species of invertebrate at different distances downstream of a sewage outlet in a river.
The table shows the results.
Table
| Distance downstream of sewage outlet / km | 0 | 1 | 2 | 4 | 8 |
|---|---|---|---|---|---|
| Number of species of invertebrate | 3 | 5 | 9 | 14 | 15 |
Which conclusion is supported by the data in the table?
The number of species increases with distance, but the increase is smaller beyond 4 km
The number of species increases by the same amount for every extra kilometre downstream
The sewage kills every species of invertebrate in the first kilometre downstream
The number of species is highest at 8 km because there is more oxygen in the water there
49 exam-style questions on AQA GCSE Biology 7.3 Biodiversity and the effect of human interaction on ecosystems, covering 7.3.1 Biodiversity, 7.3.2 Waste management, 7.3.3 Land use, 7.3.4 Deforestation, 7.3.5 Global warming, and 7.3.6 Maintaining biodiversity. Each one has a worked solution and a mark scheme showing where the marks go.