Tag Info

New answers tagged

1

I do not think there is a reproductive advantage in gray hair - it's the other way around: Normal colored hair has a reproductive advantage. But it also has a cost in terms of substances needed to build it. I make the assumption here that grey hair - which is often also more sparse - has a lower cost in terms of material. I think we are investing the ...


5

Presumably this means that at least some grey haired humans have noticeable reproductive advantage, or maybe they had it in the recent past. No it doesn't. Natural selection is not that strong, it doesn't optimize every single possible physical trait towards maximum reproducing. And as others have mentioned, having lots of grey hair usually ...


0

Human skin is made up of three layers [1]: Epidermis; it contains no blood vessels; it has 5 cellular layers (starting from surface): stratum corneum stratum lucidum stratum granulosum stratum spinosum stratum germinativum Dermis; it is separated from the above by the basal membrane; made up of connective tissue (with blood vessels and nerve endings) ...


-1

Das gives a good answer but its generally an incorrect approach. Anthropology in its field of ethnomusicology teaches that the largest part of our musical tastes are drawn from our culture. Though we be not Tabula rasa; we do come with little inert training in what type of music we appreciate. Das papers only point out differing abilities to create music and ...


1

You're confusing an emergent system with a determined system. Your cells have programming which emerges as the form you see. You are using determinism to decide what your form should be. Determinism gives one reaction for every action. Biology is emergent, not deterministic. The biological mechanisms which are responsible for healing exist in a different ...


1

Many examples of animals which have more difficulty maintaining their population size than humans exist. This is partially why some species go extinct. The Tasmanian Devil is at high risk for extinction from a genetic predisposition for cancer onset by infection. Your premise that humans are unhealthy is not sound. Humans are long lived, genetically diverse ...


2

Well, there are some questions regarding what population. I don't have 50 rep, so I can't really ask for clarifications; populations range a lot, from your typical avoidance of inbreeding (laws against cousin marriage) to Tamils with their high rates of first cousin marriage (so high that they don't have any pedigree inbreeding depression due to selection, ...



Top 50 recent answers are included