Greatest scientific evidence for evolution?

[Final-Fan]

angrypoolman said:

Final-Fan said:

It ... suggests that we used to be a lot hairier.  

I'm a bit confused, I thought you were asking for examples of vestigial stuff.  And then I thought your recent post asked how those two examples were in fact vestigial instead of some other kind of weirdness -- was asking what their old purpose was.  

So ... was I wrong?   

[edit:  To put it another way, our having goosebumps suggests that we are descended from a primate species that was hairy, which we are not in comparison.]

no you werent wrong.

but i still fail to see how goosebumps are proof that we evolved from harier animals. it seems like an educated guess (based off the theory it attempts to explain) at best.

Well, no, it doesn't prove it in the sense of "1+1=2" or the way the Pythagorean Theorem can be proven.  It's more like "it would make sense if this was the case".  And evolution has millions of things that "make sense" with the theory, and they make more sense with evolution than, say, Lamarck's idea, or the idea that everything has happened in the last 5000 years a la Young Earth Creationism.  

For goosebumps, what other explanation of their existence makes as much sense?