Experimental molecular evolutionary studies have shown that

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Experimental molecular evolutionary studies have shown that a heterogeneous environment favors adaptive radiation. This means that in environments where there is a lot of variation, different populations of organisms may undergo different adaptations depending on their specific circumstances. However, there is no evidence to suggest that a heterogeneous environment induces an increase in the mutation rate, and it is not true that substantial molecular evolution cannot be observed in less than a year, even in bacteria.

Experimental Molecular Evolutionary Studies Have Shown That