What is one source for the variation that drives natural selection?
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An organism can only pass on the traits it has. If all the organisms of a spieces are the same, then they all will pass on the same genes. For example, Dragons all have purple skin. A disease strikes that kills out all the dragons with purple skin. As a result, the spieces would go extinct. However, it there had been some pink dragons, they would have survived and the spieces would live on.
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The one source of variation that drives natural selection is genetic variation which means that an organism can pass on the traits that it has.
EXPLANATION:
In other words, an organism can pass only the unique traits to the offspring which leads to continuation of any species.
Natural selection is the theory which states that "organisms that are best adapted to live in an area will reproduce and survive". Genetic variation does exist in a population and makes an individual adapt or not adapt to an environment. If for instance, genetic variation was not present, the species would become extinct in short time.
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