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I think @feetwet has given a good argument why the facial hair in females are suppressed rather than absent. Facial hair signal sexual maturity and play role both in inter-sexual selection (attracting females, like peacock's tail) and intra-sexual selection - demonstrating dominance over other members of the same sex. Another "hairy" trait also ...


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Hormones explain the sexual dimorphism. Expose females to androgens and they develop masculine facial hair. See hirsutism. Also research: ... women’s intermediate facial follicles respond to men’s higher androgen levels by synthesizing more hair over several days ....


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At least some of it is a side effect of the way human skin develops. Humans actually have the same number and density of hair follicles as great apes, it is merely that our hair develops as short vellum hair rather than the thicker, longer hair of great apes. This is a side effect of the same genes that control eccrine sweat gland development, turning on the ...


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Shoulder Horizontal Abduction/Adduction. https://www.youtube.com/watch?v=R3xJDsJ_Nw4&ab_channel=InteractiveBiology "the motion of bringing the arm across the chest is called shoulder or glenohumeral horizontal adduction. Glenohumeral horizontal adduction is demonstrated starting from 90? of shoulder flexion with the arm slightly away from midline in ...


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It’s humeral retroversion at a 90 degrees abduction angle with extended elbow and slightly internally rotated shoulder.


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