Evolution is a change in the ____ characteristics of a population over time through a process of natural selection which may result in the formation of a new species. * The theory of evolution by ____ selection states that all species of living things have ____ from simple life forms that first developed more than ____ billion years ago. Evolution occurs through natural selection of ____ that give rise to ____ best suited to their environment. * If two populations of one ____ become so different in phenotype that they can no longer ____ to produce ____ offspring they have formed two new species.

4.6.2.2 Evolution

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