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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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How does increasing biodiversity usually affect ecosystem stability?
Which human activity is most directly responsible for habitat fragmentation?
What is meant by the carrying capacity of a habitat?
What does a pyramid of biomass represent?
Which practice would best conserve biodiversity on farmland?
In primary succession, what is the first colonising organisms on bare rock typically called?
Why is sampling at random locations within a study area important?
What is a food web?
What is the usual direction of energy flow in an ecosystem?
What is an invasive (non-native) species likely to do in a new habitat?
Which action would most directly increase carbon storage in an area and help mitigate climate change?