About 66 million years ago a large asteroid collided with the Earth. Very many species, including all of the large dinosaurs, became extinct at about this time. Some smaller species survived.
Explain how the collision could have caused the extinction of very many species, and suggest why some species survived.
71 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.