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Small differences in height and start of physical maturity are seen. In the first decade of human life, there is a significant amount of overlap between children of both sexes. The gradual growth in sex difference throughout a person's life is a product of various hormones.
A Malayali man with medium skin tone, of medium build, and with facial hair. A man is an adult male human. [a] [2] [3] Before adulthood, a male human is referred to as a boy (a male child or adolescent). Like most other male mammals, a man's genome usually inherits an X chromosome from the mother and a Y chromosome from the father.
The term man (from Proto-Germanic *mann-"person") and words derived from it can designate any or even all of the human race regardless of their sex or age. In traditional usage, man (without an article) itself refers to the species or to humanity (mankind) as a whole.
A person (pl.: people or persons, depending on context) is a being who has certain capacities or attributes such as reason, morality, consciousness or self-consciousness, and being a part of a culturally established form of social relations such as kinship, ownership of property, or legal responsibility.
The authors differentiate between sex differences, caused by biological factors, and gender differences, which "reflect a complex interplay of psychological, environmental, cultural, and biological factors". [14] Gender identity is thus seen as a "psychological concept that refers to an individual's self-perception". [14]
However, variation in the magnitude of sex differences between more or less developed world regions were due to changes between men, not women, in these respective regions. [21] That is, men in highly developed world regions were less neurotic, extroverted, conscientious and agreeable compared to men in less developed world regions.
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Fertilization is the fusing of the gametes; a sperm cell and an ovum (egg cell) fuse to form a single-cell zygote.This is the beginning of the diploid phase of the human life cycle after two genetically unique haploid cells created via meiosis and chromosomal translocation combine their DNA and begin to develop into a multi-cellular organism.