[mikeash]

Nobody has observed gravity either, only its effects.

[ThomPete]

Nobody observed the effect of evolution.

[jonhinson]

Evolution is simply the change in allele frequency in populations of organisms over time. This is most certainly observable.

[ThomPete]

That is by not metrics what evolution simply is.

[mikeash]

The present-day biosphere is an effect, as is the fossil record and DNA relations between species.

[ThomPete]

That does not prove evolution the way gravity is proven.

[mikeash]

How so? Evolution is just change in populations over time with common descent, and that's pretty well demonstrated through the things I mentioned, about the same as gravity is demonstrated by things falling. What's different?

[dismiss21x]

I've never seen it demonstrated definitively through the fossil record. There are a lot of assumptions and best-guesses leading back to common ancestors.

[mikeash]

I've never seen gravity demonstrated definitively either. Sure, they say that there's this force that makes stuff fall, but I've seen plenty of things go up instead of down when released.

[toasterlovin]

Evolution is observable.