The driving force behind evolution by which the environment chooses the fittest

Keep in mind that the measure of evolutionary fitness is the ability to reproduce offspring that are fertile. That is, the organisms that reproduce in the environment are the ones whose genes are passed on to the next generation. That is how evolution works.
 
Keep in mind that the measure of evolutionary fitness is the ability to reproduce offspring that are fertile. That is, the organisms that reproduce in the environment are the ones whose genes are passed on to the next generation. That is how evolution works.
 
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