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Human biological variation refers to the natural differences in physical and biological characteristics found among individuals and populations of the human species. These variations arise through the interaction of genetic inheritance, mutation, natural selection, genetic drift, gene flow, environmental influences, and cultural practices. Despite these differences, all human beings belong to a single species, *Homo sapiens*, and share a common genetic heritage. Human biological variation is continuous rather than discrete, and modern biological anthropology emphasizes that such variation does not support the concept of biologically distinct human races. Instead, it reflects adaptation to diverse ecological conditions and the evolutionary history of human populations. Morphological characteristics are among the most commonly used indicators to study human biological variation. These are observable physical traits ______ ____ ________ _____ ______ _________ __________ ____ ___ ______ ________.
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