Individuals characteristics can help them survive longer than a species that doesn't have those characteristics. This is known as "survival of the fittest" where which ever species or animal has better suited characteristics will survive longer. The first example would be the beak of a finch. If a finch's beak is longer or stronger than they are most likely better suited for it's environment because they are capable to do things with their beaks that other finches couldn't do. The second example would be a finches neck. If one finch has a longer neck it could do things a finch with a shorter neck couldn't, such as reaching food that is harder to reach. The third example would be a finch's feet. Some finch's could have claws or more durable feet so they could grab easier or other things like that easier so it is better suited for it's habitat.
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