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Variation within species


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Variation within species
Within the same species, individual organisms can look very different. For all three species of butterflies, wing color and pattern varies depending on the season during which they were born. The butterflies at the top were born under different temperature and light conditions than the ones at the bottom.

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The questions "What are species?" and "How do we identify species?" are difficult to answer, and have led to debate and disagreement among biologists. See how consensus on answers to these questions can steer global, political, and financial pressures that affect conservation efforts.
A gene pool is the collective set of genes found across all organisms in a population. In this page, you will learn about variation within gene pools, as well as the ways in which this variation can be an advantage to populations of organisms.

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