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Pastimes : Let's Talk About Our Feelings!!!
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To: epicure who wrote (41237)6/20/1999 9:44:00 PM
From: Chuzzlewit  Read Replies (2) of 108807
 
Natural evolution has not been shown. It has -- even to the extent of speciation as in the case of the Bufo fowleri B. americanus and B regularis complex. The fact that a immunologically distinct flu bug comes around every few years ought to convince you of the fact of evolution.

In any event, you are confusing the fact of evolution with the theory that explains it. For example, human beings are different in physical stature now then they were just a few thousand years ago. The genetic composition of natural populations of various species and subspecies have changed significantly over the past several decades. These are examples of evolution.

X, theories are never stated as facts by scientists.

CTC

Speciation is intriguing because it generally requires geographical isolation and significant periods of time to effect genetic incompatibilities. But those incompatabalities already exist in certain natural populations such as the Rana pipiens complex. All that would be required for speciation would a catastrophe that would wipe out intermediate breeding populations. Demonstration of speciation is not necessary for the theory of evolution.

You might be interested to know that many evolutionists do not consider Darwinian evolution the sole explanation for evolution. Non-Darwinian evolution is also important. The hallmark of Darwinian evolution is the notion of adaptive change. Yet the literature is replete with examples of non-adaptive evolution.

CTC
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