There is ____ in all organisms. This means that there are lots of ____. Some of those differences mean an organism might have a ____ chance of surviving. They can be called ____ characteristics. If an organism ____, it will ____ and its ____ have the same ____. This is called ____ selection. If it gives them enough of an ____, eventually they could out-____ other organisms without that ____. Over a ____ period of time, all organisms in that ____ could have that characteristic. This is ____ by natural ____.

Evolution by Natural Selection

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