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Apr
19
comment Why haven't prey evolved the ability to always outrun their predators?
There are limits to how fast a given animal can go. Prey also tend not to run in straight lines so there are many ways to improve via evolution.... there are no supersonic animals for instance!
Apr
19
answered Why haven't prey evolved the ability to always outrun their predators?
Apr
12
comment Why is there no symmetry in pigmentation when comparing people north and south of the equator?
Its true but remember I'm not really trying to justify that latitude is the perfect correlation with skin pigment, just noting that the skin tone for some first nations people is darker than other neighboring peoples.
Apr
9
revised Why is there no symmetry in pigmentation when comparing people north and south of the equator?
added 458 characters in body
Apr
9
comment Why is there no symmetry in pigmentation when comparing people north and south of the equator?
It means that the answer is really a combination of latitude, how long a people has been there, and the speed at which pigmentation mutants show up. It doesn't change so quickly that all people are equally dark at the same latitude or so slowly that you find completely pale people at the equator.
Apr
7
comment Why is there no symmetry in pigmentation when comparing people north and south of the equator?
Just remembering some of the south pacific and australian aborigines being so dark sometimes.... no strong reference. I did find this reference that pigmentation is correlated to latitude. To the extent that it is symmetric or not depends on how perfect you expect the symmetry to be... sciencedirect.com/science/article/pii/S0047248400904032
Apr
1
answered Why is there no symmetry in pigmentation when comparing people north and south of the equator?
Mar
30
answered difference between transcriptional activator and general transcription factors?
Mar
6
revised Why are there no organisms with metal body parts, like weapons, bones, and armour? (Or are there?)
added 49 characters in body
Mar
5
revised Why are there no organisms with metal body parts, like weapons, bones, and armour? (Or are there?)
added 75 characters in body
Feb
28
awarded  proteins
Feb
22
awarded  Good Answer
Feb
15
awarded  Nice Answer
Dec
30
comment Why even if all requirements for natural selection are met, it may not happen?
if all the living things are killed for instance there is no natural selection. if the environment does not affect the outcome of reproduction, i suppose that natural selection is not occurring, but its hard to imagine such a situation
Dec
20
comment Do humans contract more physical sicknesses and diseases than animals do?
I'd say humans do have more illnesses than similar animals - for the most part animals do not have doctors or medical care - the simple understanding of sepsis and sewers has extended lifespan tremendously. Previously we would just get sick and die. statistically speaking that means we get sick more often simply because we recover. I doubt that animal's immune system is weaker than humans though.
Dec
14
awarded  Yearling
Dec
8
revised Why are there no wheeled animals?
awkward phrasing
Nov
26
awarded  Enlightened
Nov
26
awarded  Nice Answer
Nov
23
reviewed No Action Needed IgA complement activation