quality:corruption, stylistic:tone, structural:reformatting
Human variability, or human variation, is the range of possible values for any characteristic, physical or mental, of human beings. Frequently debated areas of variability include cognitive ability, personality, physical appearance and immunology.
Variability is partly heritable and partly acquired.
As the human species exhibits sexual dimorphism, many traits show significant variation not just between populations but also between the sexes.