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This video explains why variation is necessary for natural selection and where variation comes from.
This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 3, as of -0001-11-30.
This resource received a 3* rating because it is part of a collection called DNA and Cell Division, which is part of the larger Biology collection, which received a rating of 3-Exemplary in the Curriki Review System. You can learn more about the Biology collection by reading its review and comments.