Pages

Sunday, October 16, 2005

Evidence of evolution

I don’t remember for sure, but I think it was in a book by Dawkins that I ran across an argument for the evolution of marine mammals from land mammals: to wit: marine mammals propel themselves through water by wagging their tails up-and-down instead of side-by-side like fish.

Even if this indicated common ancestry, I don’t see how it indicates the direction of descent. Why not say that land mammals were descended from marine mammals?

But that question aside, dogs wag their tails side-by-side, and I also observed, on a recent walk, that ducks also wag their tails side-by-side. So do crocodilians.

So, by evolutionary logic, land mammals and marine mammals belong to one evolutionary tree while dogs, ducks, and alligators belong to a different evolutionary tree.

In addition, if marine mammals are descended from land animals since they both wag their tails up-and-down, then, by parity of reasoning, ducks, as aquatic animals, are descended from dogs or protodogs since they both wag their tails side-by-side.

Now all we need to cinch the argument is a fossil dog with a duckbill and feathers.

Where would we be without the theory of evolution to help us sort things out?

2 comments:

  1. Steve, just before coming to your blog and seeing this entry, I read a recent article by the biologist Jonathan Wells, which I would recommend to the readers of this blog:

    http://www.discovery.org/scripts/viewDB/index.php?command=view&id=2933

    Jason Engwer
    http://members.aol.com/jasonte
    New Testament Research Ministries
    http://www.ntrmin.org

    ReplyDelete
  2. I once ate a hamburger that tasted fishy. Does that count as evidence?

    ReplyDelete