Scientists investigated antibiotic pollution in two different lakes, Lake Albert and Lake Edward. They counted how many species of bacteria were resistant to antibiotics and how many species of bacteria were killed by antibiotics. Their results are shown in the table below:
| In Lake Albert | In Lake Edward | |
|---|---|---|
| Resistant to antibiotics | 65 | 30 |
| Killed by antibiotics | 25 | 45 |
Which lake is likely to have the highest levels of antibiotic pollution? Explain your answer.
38 exam-style questions on OCR GCSE Biology 5.2 Natural selection and evolution, covering 5.2.1 Genetic variation within a population, 5.2.2 Developments in classification systems, 5.2.3 How evolution occurs through natural selection, 5.2.4 Evolution as change over time, 5.2.5 Evidence for evolution, and 5.2.6 Darwin and Wallace. Each one has a worked solution and a mark scheme showing where the marks go.