[ExI] evolution

[William Flynn Wallace]

I read today in Neuroscience News that gut microbes control our body's
temperature.

I assume that they are not there at birth, though they could have been
picked up via the birth canal.

How does it happen that entirely separate organisms come to regulate any
body function?  I reckon that you could ask the same thing about gut
microbes making chemicals for the brain.

bill w
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