The word theory, in the context of science, does not imply uncertainty. It means "a coherent group of general propositions used as principles of explanation for a class of phenomena" (Barnhart 1948). In the case of the theory of evolution, the following are some of the phenomena involved. All are facts:<quoted text>Gravity is NOT a Theory...
It is a Law!
The Theory is "How" Gravity works!
Evilution is not a law... it is only a Guess, a thought, Conjecture....
You can only "Believe" it's real... you have no proof it is!
No dog ever turned into a cat, only an uglier dog!
No microbe has ever grew legs, and went to college... ever!
• Life appeared on earth more than two billion years ago;
• Life forms have changed and diversified over life's history;
• Species are related via common descent from one or a few common ancestors;
• Natural selection is a significant factor affecting how species change.
Many other facts are explained by the theory of evolution as well.
2. The theory of evolution has proved itself in practice. It has useful applications in epidemiology, pest control, drug discovery, and other areas (Bull and Wichman 2001; Eisen and Wu 2002; Searls 2003).
3. Besides the theory, there is the fact of evolution, the observation that life has changed greatly over time. The fact of evolution was recognized even before Darwin's theory. The theory of evolution explains the fact.
4. If "only a theory" were a real objection, creationists would also be issuing disclaimers complaining about the theory of gravity, atomic theory, the germ theory of disease, and the theory of limits (on which calculus is based). The theory of evolution is no less valid than any of these. Even the theory of gravity still receives serious challenges (Milgrom 2002). Yet the phenomenon of gravity, like evolution, is still a fact.
5. Creationism is neither theory nor fact; it is, at best, only an opinion. Since it explains nothing, it is scientifically useless
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1. Barnhart, Clarence L., ed. 1948. The American College Dictionary, New York: Random House.
2. Bull, J. J. and H. A. Wichman. 2001. Applied evolution. Annual Review of Ecology and Systematics 32: 183-217.
3. Eisen, J. A. and M. Wu. 2002. Phylogenetic analysis and gene functional predictions: Phylogenomics in action. Theoretical Population Biology 61: 481-487.
4. Milgrom, Mordehai. 2002. Does dark matter really exist? Scientific American 287(2)(Aug.): 42-52.
5. Searls, D. 2003. Pharmacophylogenomics: Genes, evolution and drug targets. Nature Reviews Drug Discovery 2: 613-623