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Biology OCR A- Biodiversity
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What is species richness
What is species richness
Species richness is a measure of different species in a community
What is a keystone species
What is a keystone species
Species which has a disproportionate effect upon its environment relative to its abundance
What is one advantage and disadvantage of stratified sampling
What is one advantage and disadvantage of stratified sampling
Ensures all areas of habitat are sampled and not under-represented
May lead to an over-representation of some areas
Describe pitfall traps
Describe pitfall traps
Small container hidden in soil to catch small animals, should contain some water and be checked regularly
What is one advantage and disadvantage of opportunistic sampling
What is one advantage and disadvantage of opportunistic sampling
Easier and quicker than random sampling
The data will be biased
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