sfs
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- Jun 30, 2003
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The dark form of the moth almost certainly was the result of a recent mutation. The mutation introduced a new trait to the species that had previously been absent. That trait happened to be favorable for survival at the time, and so it spread rapidly through the population. That's evolution. It's only the evolution of a single trait caused by a single mutation, but the same process is going on constantly. No species remains the same.And after many generations, not one single moth evolved. The traits are still there. That is why they go from predominantly dark, to light and back to dark again. The ones with the traits that survive are more successful at procreating. Sure, an attribute can go away completely over time, but that is different from something brand new coming into existence that was not there before, and becoming a dominant trait in the species.
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