In spring, water covers both the shallow edges and the deeper centre of a pond. During a hot, dry summer, the shallow edges dry out. A species of freshwater snail can live only in water. In autumn, the pond fills again.
State what is meant by the distribution of a species.
Explain how this seasonal environmental change affects the distribution of the freshwater snail.
83 exam-style questions on AQA GCSE Biology 7.2 Organisation of an ecosystem, covering 7.2.1 Levels of organisation, 7.2.2 How materials are cycled, 7.2.3 Decomposition, and 7.2.4 Impact of environmental change (HT only). Each one has a worked solution and a mark scheme showing where the marks go.