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In that view, many human artifacts could be considered subject to sexual selection as part of the extended phenotype, for instance clothing that enhances sexually selected traits. [2] During human evolution, on at least two occasions, hominid brain size increased rapidly over a short period of time followed by a period of stasis.
However, when an avatar is human and discernibly gendered, it usually appears to be a man. [30] [31] Depictions of skeletons typically have male anatomy rather than female, even when the character of the skeleton is meant to be female. [32] Restroom symbols show the male as the default person, while the female is identified by a skirt. [33]
[7] [11] In the 21st century, the noun female is primarily used to describe non-human animals, to refer to biologically female humans in an impersonal technical context (e.g., "Females were more likely than males to develop an autoimmune disease"), or to impartially include a range of people without reference to age (e.g., girls) or social ...
The Descent of Man, and Selection in Relation to Sex is a book by English naturalist Charles Darwin, first published in 1871, which applies evolutionary theory to human evolution, and details his theory of sexual selection, a form of biological adaptation distinct from, yet interconnected with, natural selection.
The change from the one-sex model to the two-sex model helped to create a new understanding of gender in the meaning of human history. There is an "increasing differentiation of male and female social roles; conversely, a greater differentiation of roles and a greater female 'delicacy and sensibility' are [seen as] signs of moral progress."
[1] [3] [4] [5] To what extent femininity is biologically or socially influenced is subject to debate. [3] [4] [5] It is conceptually distinct from both the female biological sex and from womanhood, as all humans can exhibit feminine and masculine traits, regardless of sex and gender. [2]
Trump's executive order declares sex as "an individual's immutable biological classification as either male or female" and states that "gender identity" cannot be included in the definition of ...
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.