tag:blogger.com,1999:blog-5794535954827182754.post1676932731888453802..comments2024-02-17T04:06:00.805-05:00Comments on Just Not Said: Convergent evolutionJohn Craighttp://www.blogger.com/profile/08729625146043379286noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-5794535954827182754.post-74365611332273187522014-08-30T11:36:42.296-04:002014-08-30T11:36:42.296-04:00I heard wider nostrils was for hotter climates...o...I heard wider nostrils was for hotter climates...or rather narrow nostrils for colder climates. Something to do with warmer the air up as it goes through the nasal passage. Not sure how true that can be.Stevenhttps://www.blogger.com/profile/15276736643046430370noreply@blogger.comtag:blogger.com,1999:blog-5794535954827182754.post-36974750505163461382010-08-21T19:29:29.200-04:002010-08-21T19:29:29.200-04:00Ed --
You know what, you're right. Basically I...Ed --<br />You know what, you're right. Basically I was being lazy by just citing something I had heard before without really thinking about it. But now that you point out the fallacy of the reasoning, it's clear that theory is wrong. It's probably much more likely that all humankind had wider nostrils, simply because they take in more air, and Caucasians may have been evolved narrower nostrils over time for heat retention reasons. Thank you for your correction.John Craighttps://www.blogger.com/profile/08729625146043379286noreply@blogger.comtag:blogger.com,1999:blog-5794535954827182754.post-23472783040439709452010-08-21T19:25:50.157-04:002010-08-21T19:25:50.157-04:00I’m having trouble with the theory that high tempe...I’m having trouble with the theory that high temperature climate humans evolved wide nostrils because there is lower oxygen in high humidity climates….. What is the percentage reduction in O2 due to higher humidity? Wikipedia has water vapor in air varying from trace amounts to 4%. So in rough terms we could have 79% N2, 21% O2 and 0% H20 through 75.8% N2, 20.2% O2, and 4% H20. And by Darwinian terms we must believe that this one lived due to wider nostrils, and that one died before it could reproduce as well due to narrower nostrils – when the mouth is a gigantic orifice by comparison. And this pattern would have to continue well enough to create an entire population with wide nostrils. I’m not seeing it – how do you see this panning out? <br />EdAnonymousnoreply@blogger.com