Living things differ (have ____ from each other). The ones that are ____ adapted to their ____ survive and those that are ____ well adapted ____. If an organism is better adapted, it is more likely to ____ and pass along their ____ to their ____ (babies). The descendants then ____ the characteristics. Over time more and more ____ in the environment end up with the ____ that help them survive. This change over time is called ____.

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