The figure shows a food web for five species in a moorland community. The moorland has been a stable community for many years.
Figure: A food web for five species in a moorland community

A pathogen destroys all of the heather beetles in the moorland. Explain how this could cause the number of red grouse to decrease.
Give the meaning of the term interdependence.
Give one feature of a stable community.
63 exam-style questions on AQA GCSE Biology 7.1 Adaptations, interdependence and competition, covering 7.1.1 Communities, 7.1.2 Abiotic factors, 7.1.3 Biotic factors, and 7.1.4 Adaptations. Each one has a worked solution and a mark scheme showing where the marks go.