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Human phys­i­cal appear­ance is the out­ward phe­no­type or look of human beings. There are infi­nite vari­a­tions in human phe­no­types, though soci­ety reduces the vari­abil­i­ty to dis­tinct cat­e­gories. Phys­i­cal appear­ance of humans, in par­tic­u­lar those attrib­ut­es which are regard­ed as impor­tant for phys­i­cal attrac­tive­ness, are believed by anthro­pol­o­gists to sig­nif­i­cant­ly affect the devel­op­ment of per­son­al­i­ty and social rela­tions. Humans are acute­ly sen­si­tive to their phys­i­cal appear­ance, some the­o­rize for rea­sons of evo­lu­tion. Some dif­fer­ences in human appear­ance are genet­ic, oth­ers are the result of age, lifestyle or dis­ease, and many are the result of per­son­al adorn­ment. Some peo­ple have tra­di­tion­al­ly linked some dif­fer­ences in that per­son­al appear­ance such as skele­tal shape with eth­nic­i­ty, such as prog­nathism or elon­gat­ed stride. Dif­fer­ent cul­tures place dif­fer­ent degrees of empha­sis on phys­i­cal appear­ance and its impor­tance to social sta­tus and oth­er phenomena.