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Because we can see the process happening.
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But the process is not permanent. If you look at Logic's link below, the fruit flies were subject to different diets, causing them to adapt. If the diets were normalized again, they would simply change back. How then can it be assumed that 'these many small changes over a long period of time causes a change in species' be true if the small changes are not even permanent.
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They adapt to fit their CURRENT environment, if you change the environment they adapt to fit the new environment, if you revert them to the original environment they will re-adapt to how they best survived in the old environment
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How can it not? I don't see the problem.
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If a creature has a minor change, but then changes back, how could it ever accumulate enough changes to become a new species?
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Edited by Demagogue: 5/4/2015 3:53:27 AMBy not changing back.
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Not a very scientific assumption.
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Explain.
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You would need to test or study on what is the basis for permanent adaptions and temporary adaptions. What are they, how do they come about, what are their uses or benefits from what was before? What are the odds that multiple changes could happen in a species? Could these changes cascade? At what point would we consider a creature to no longer be of the same species? When it could no longer mate with others of its original species? There are too many questions, dependent variables, and unknowns to simply assume that the adaptions would simply not revert.
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Why? The answer is obvious- the environment.