A very nice post, Loudmouth, but you've used rather a lot of big words. I do
not mean this as a slight to Des. At an introductory level you need to make it simpler and clearer.
E.g., "Phylogeny"
Though you indirectly explain this term subsequently it's very presence is possibly, a show stopper for someone new to all of this and without much to build on.
2. Phylogeny should be related to the age of fossils. That is, the evolutionary tree built from differences in body shape should be reflected in the ages of the fossils. The body shape tree is made independently of the age, but the two still match up. This test shows how the fossils are laid down according to evolutionary mechanisms, or the inheritance of morphology and adaptation of new morphology. Combine this with the genetic data above and you have three independent variables that all come to the same conclusion, evolution probably happened.
Let me try:
If todays living things got here by evolutionary steps then we should see that extinct fossilzed animals that are nearer in time should be more like those living today. We should also see that as we go further back in time they should be less and less like those today.
Now that we know about DNA and the genetics of living things we should also expect that those which the fossil record show separated more recently should have more similar genetics.
The fossil record, it's dating, the relationships of the bodies of living and extinct things AND the genetics of living things ALL are matched up exactly has evolution would predict. They are independently measured but all work out correctly.
That's my attempt. I'm not sure if it's simpler or not. That is in the eye of the beholder.
[This message has been edited by NosyNed, 04-23-2004]