A species lives on two islands and in a breeding centre. The table gives the number alive at the end of each year. There are no individuals elsewhere.
Table
| Year | Island P | Island Q | Breeding centre |
|---|---|---|---|
| 1 | 25 | 12 | 6 |
| 2 | 0 | 5 | 8 |
| 3 | 0 | 0 | 7 |
| 4 | 0 | 0 | 0 |
Which statement correctly identifies the year of extinction and its reason?
Year 2, because the species had disappeared from one of its original island habitats.
Year 4, because no individuals of the species remained alive in any recorded location.
Year 3, because no individuals of the species remained alive in either island habitat.
Year 1, because fewer individuals lived in the breeding centre than in either habitat.
37 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.