Natural Selection

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This theory states that happens by natural selection.
Individuals in a show a wide range of variation.
This variation is because of differences in .
Individuals with characteristics most suited to the are more likely to survive and reproduce.
The genes that allowed the individuals to be successful are passed to the in the next generation.
Individuals that are adapted to their environment are less likely to survive and reproduce.
This means that their genes are less likely to be passed to the next .
Given enough time, a species will gradually .