A factory releases warm water into a stream. Scientists found far fewer mayfly larvae in the stream downstream of the factory than upstream of the factory.
Suggest how the warm water could reduce the number of mayfly larvae downstream of the factory.
Give one other environmental change, not caused by the factory, that could change the distribution of the mayfly larvae in the stream.
40 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.