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Investigating VariationInterspecific variation is the way one species varies from another.Intraspecific variation is the way members of the same species differ from one another.Continuous: height, shoe size. Discontinuous: Blood group. Making Measurements:We cannot sample every human on earth and so instead we use sampling. Sampling involves taking measurements of individuals selected from the population of organisms that are being investigated.If these individuals are representative of the entire population then the data can be relied upon.There are several reasons why they may not be representative;Sampled Bias – the selection process may be biased.Chance – the individuals chosen may be due to chance and therefore not representative.


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