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Communities (GCSE Biology)

The following is a GCSE Biology test covering 'Communities' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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Which of these best describes a stable community?
What is the usual direction of energy flow in an ecosystem?
How does increasing biodiversity usually affect ecosystem stability?
Which practice would best conserve biodiversity on farmland?
Approximately what percentage of energy is transferred from one trophic level to the next in most ecosystems?
What is meant by the carrying capacity of a habitat?
What is a food web?
Why might a species migrate seasonally between regions?
Which term describes two species living closely together where both benefit?
Which sampling device is most appropriate for estimating abundance of ground-dwelling insects?
Which human activity is most directly responsible for habitat fragmentation?