Sampling, A method for estimating the number of organisms in a particular area, Opportunistic sampling, Sampling the organisms easily available, Systematic sampling, Sampling species in different areas of the same habitat, Belt transect, Two parallel lines are marked in a habitat and samples are taken between them, Chance, This factor can be minimised by taking a large number of samples, Species Evenness, How similar the numbers of individuals of each species are in a community, Random Sampling, A method for collecting data which involves selecting the individuals by chance, Stratified sampling, Splitting populations into sub groups and then taking a random sample, Line transect, A line is run through a habitat and samples are taken at certain intervals along the line, Sampling bias, This factor can be removed by taking random samples, Species Richness, The number of different species living in a particular area, Biodiversity, The variety of living organisms present in an area.

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