This is why people can't completely separate the social constructs from the biological.
Dimorphism - distinguishable characteristics that separate sex. For instance, this is a female and male pheasant (female on left.)
In the animal kingdom, many species have a high degree of sexual dimorphism. They clearly display size and color differences - and this commonly refers to observable (i.e., aesthetic characteristics.) Humans have a very low degree of sexual dimorphism, which means we do not display remarkable size and color differences between the sexes. But there's also a big, big social qualifier in there: animals (usually) don't wear any sort of body coverings. Humans almost always do. If you do not examine genitals or skeletal structure (neither of which most people can see with their naked eye.............usually, unless superman) determining "male" or female" on looks alone is next to impossible. "Observable characteristics" is going to be highly dependent on the arena in which the observing takes place. On an autopsy table? sure. At the mall? probably not. You can't just say "observable characteristics," without qualifying: who is observing and why?
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