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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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What is ecological succession?
Which measurement would you use to construct a pyramid of biomass?
Why might a species migrate seasonally between regions?
Which term describes all the living organisms found in the same habitat?
Which organism is best described as a decomposer?
In a food chain, which group are primary consumers?
What is a food web?
In an ecosystem, what role do detritivores play?
What is an invasive (non-native) species likely to do in a new habitat?
In a mark–release–recapture study, which assumption is important for estimating population size?
What is meant by the carrying capacity of a habitat?