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Evolutionary science isn't a closed book : Comments
By Hiram Caton, published 2/9/2005Hiram Caton argues as part of the debate on natural selection, maybe introduce intelligent design at tertiary level.
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I’ve grabbed a lot of the below from the www.straightdope.com (handy site) discussion on micro v macro evolution, which itself references ‘The Triumph of Evolution and the Failure of Creationism’ by Stephen Jay Gould.
Your comments suggest you accept microevolution but not macroevolution. Cool, we’re half way there!
Macroevolution is actually the same story as micro, just on a larger scale. Creationists haven’t come up with a reasonable explanation why evolution should stop at the boundary of a species, rather than include the process that changes one species to another over time. Fact is, there’s no such reason. It's all one process.
The evolution of a family is no different in its basic nature, and involves no different processes, from the evolution of a genus, since a family is nothing more than a collection of related genera. And genera are just collections of related species. The conclusion reached some time ago was that the same principles of adaptive divergence - primarily the processes of mutation and natural selection - going on within species, accumulate to produce the differences we see between closely related species--i.e., within genera. Q.E.D.: If adaptive modification within species explains the evolutionary differences between species within a genus, logically it must explain all the evolutionary change we see between families, orders, classes, phyla, and the kingdoms of life (the ‘mutation’ you argued is, easily pictured as a tiny step in a much bigger journey, in other words, yes, its evolution, just on a smaller scale).
Creationists say there can be variation within kinds but not between kinds. Biologists assert that there has been one history of life: all life has descended from a single common ancestor; therefore one process-evolution-is responsible for the diversity we see.
The truth is there is no magical dividing line between micro and macroevolution. Biological evidence shows that changes within species are caused by the same natural forces that eventually cause differences between species, genera, families, and so on.
So to re-iterate (again): evolution r00lz. No one has come close to providing a decent challenge to it. Ever.