Evolution uses just as much circular reasoning as to the fact that it cannot be reproduced in a lab. The whole concept of evolution is speculation therefore just going around telling everybody its true because scientists say its true is circular reasoning.
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The scientists have created experiments that have been subjected to peer review and then have been recognised as satistactory in showing the mechanism of evolution. Therefore this cannot be considered "circular reasoning".
Unlike "creation is true becuase the Bible syas so", which, of course, isn't circular reasoning. [/sarcasm]
Six of the Many Reasons You are Completely and Utterly Wrong:
1. Not being able to reproduce something in a laboratory setting does not any means indicate circular reasoning. I don't know how anyone could come to that conclusion. No one is ever going to reproduce the Holocaust under laboratory settings. Does that make anyone who doesn't deny the Holocaust guilty of circular reasoning? (If your going to shout "Godwin's Law!" or feel uncomfortable with that example, replace it with the assassination of Abraham Lincoln, the burning of the library of Alexandria, Columbus landing in the Americas, or any other historical event that you can't reproduce under laboratory settings. I just chose the Holocaust because of how incredibly well-documented it was and because of the enormous amounts of evidence for it.)
2. You could argue that history and science are two different fields of study. Well, obviously. However, not being able to reproduce something in a lab doesn't mean it's not scientific. Some things - by definition - are too large or happen over too great a time scale to be reproduced in a lab. We can't reproduce the Big Bang in the lab, but that does not mean it's a bad scientific theory or untrue. (Besides, if we did manage to do so, well, we'd never know because it would utterly destroy the universe.) You can't reproduce historical events perfectly under laboratory settings (see point 1). And some areas of science deal with things that happened in the past. (You may have heard of this thing called "natural history.") That's why we rely on observations of the natural world, not just what we can reproduce in the lab.
3. Evolution is not just speculation. Speculation means something that doesn't even count as a hypothesis. Evolution is a theory (which means something different in the scientific world than ordinary speech -- look it up if you don't belief me.) A theory has a lot more weight than a hypothesis, let alone simple speculation.
-continued from previous comment-
4. Scientists don't go around simply saying "evolution is true because we say so." No that's not how science works! The provide evidence. They spend years researching the subject. They come up with evidence and come to conclusions and submit their findings to the scrutiny of other scientists. They have to provide detailed explanations. Evolution isn't true because anyone says it's true. If you were to ask someone to explain why evolution is true, you'd more likely get someone explaining a small part of the enormous body of evidence that backs it up. There are lots of books out there that explain that evidence. Why don't you read one?
6. Humans have been performing artificial selection outside the laboratory for ages now. What makes you think that we can't do that inside the lab? (Why don't you look up the domestication of silver foxes?) Now, artificial selection isn't the exact same thing as natural selection, quite obviously, but the processes are analogous and artificial selection shows that natural selection can happen.
Wow, failing at circular reasoning. That IS impressive!
Evolution has been observed in labs, many times.
Gravity uses just as much circular reasoning as to the fact that it cannot be reproduced in a lab. The whole concept of gravity is speculation therefore just going around telling everybody its true because scientists say its true is circular reasoning.
Fixed that for ya, inverter, with a theory that has less evidence in its favor than evolution.
Confused?
So were we! You can find all of this, and more, on Fundies Say the Darndest Things!
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