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29m
comment Why aren't we allowed to refreeze previously thawed breastmilk in refrigerator?
You may want to try asking this same question on skeptics.SE
5h
comment What is the minimum air pressure the human body can tolerate if oxygen supply is not an issue?
You might be interested to know what happen to our body in a vacuum. It does not tell you "the minimum pressure under which we can survive if we were to assume we don't need oxygen" but it might give you some sense of what you're looking for.
5h
comment What is the minimum air pressure the human body can tolerate if oxygen supply is not an issue?
I think one cannot really separate the lack of oxygen from air pressure. Because the inside pressure balance the outside pressure, if the pressure is low outside, one cannot inhale lots of air without lung injury. Similarly, a scuba diver always inhale air at the pressure associated with its depth. (In consequence divers absorb much more oxygen (and consume more air) in deep water than in shallow water). You may eventually separate air pressure from oxygen if you consider someone who put a single arm or leg in a artificially very low pressure environment.
1d
accepted List of heritability estimates in humans?
1d
comment List of heritability estimates in humans?
Awesome database! Thanks a lot.
1d
revised Effect of natural selection on phenotypic variance
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2d
revised Effect of natural selection on phenotypic variance
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2d
revised Effect of natural selection on phenotypic variance
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Apr
20
accepted Population genetics and the fitness probability distribution. Why is the arithmetic mean all we need?
Apr
19
comment Heterozygosity and overdominance
Thanks a lot for your answer. I'm traveling right now and I don't have time for reading up your answer. I'll read it wednesday or thursday probably.
Apr
19
comment What are the costs associated with carrying lots of genetic material
What do you mean "cleaning up this material"?
Apr
19
revised Effect of natural selection on phenotypic variance
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Apr
18
revised Why haven't land animals evolved beyond urination?
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Apr
18
comment Why haven't land animals evolved beyond urination?
@ThePopMachine You might want to create another post and to ask a more specific question about the physiology of Nitrogen excretion and why different solutions (Ammonia, Uric acid and Urea) are differentially costly in terms of energy. Consider this post as it had answered the evolutionary part of the question.
Apr
18
revised Why haven't land animals evolved beyond urination?
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Apr
18
comment Why haven't land animals evolved beyond urination?
@ThePopMachine Well, Amonia is a gaz, Urea is liquid and Uric acid is solid (it makes cristals if I'm not mistaken). So, yes it can be excreted through solid form but it cost lots of energy (ATP). But you're right that my answer does not explain why it is more costly. But I know nothing about physiology and I can't give this answer $\ddot \smile$ I'll let someone else to give info about that if you're waiting for them.
Apr
18
asked Effect of natural selection on phenotypic variance
Apr
18
revised What are the costs associated with carrying lots of genetic material
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Apr
17
revised Why haven't land animals evolved beyond urination?
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Apr
17
answered Why haven't land animals evolved beyond urination?