On 12/01/2011 7:14 AM, Patrick Elliott wrote:
>
> Oh, and in the case of snakes, during very early development, as I
> understand it, they do form limbs, but then those are reabsorbed, before
> they form fully, the "code" turning off, and other code scavenging the
> remains for other purposes.
>

Well yes.  During early development you and I formed gills but before 
they were fully formed they were reabsorbed or scavenged for other purposes.

You wouldn't say that all tetrapods possess gills today though would you?

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