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Genes and the environment have an effect on human biological variation in seen characteristics, physiology, disease susceptibility, intellectual competencies, frame length and life span. Though human beings vary in lots of tendencies (which includes genetic predispositions and physical features), any  people are at least ninety nine% genetically comparable. Humans are sexually dimorphic: commonly, men have more frame power and females have a better frame fats percent. At puberty, human beings develop secondary sex traits. Females are able to pregnancy, commonly between puberty, at around 12 years, and menopause, around the age of 50.