Revise: Distribution of organismsIdentifying organisms
Abiotic factors are non-living variables. Biotic factors are the interactions between organisms. Both affect diversity and distribution. Sampling helps us to estimate numbers of organisms in an area.
Identifying organisms can be challenging, particularly when there could be hundreds of different species within any one sample. Scientists use paired-statement keys to make it easier to identify organisms that are sampled.
Paired-statement keys are set out as a list and you simply start at number one on the list and work your way through until you reach the name of the organism.
Below is a simple paired statement key for garden invertebrates. Pick one of the organisms and work your way through the flow chart to identify it.