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Human biological variation refers to the observable and measurable differences among individuals and populations of Homo sapiens, arising from genetic, environmental, and socio-cultural influences. These variations are expressed in physical traits, physiological characteristics, biochemical properties, and genetic compositions. Although all humans belong to a single species with a common origin, populations differ in certain features due to adaptation, mutation, natural selection, genetic drift, gene flow, and environmental pressures. Human biological variation is continuous and clinal rather than discrete, meaning traits change gradually over geographical space rather than forming sharply defined categories. The concept rejects _________ _____ __________ _____ _______ ________ _________ ________ __________ ____ __________ ______.
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