Heredity, Passing traits from parents to offspring, Trait, A characteristic of a living thing, Gene, A segment of DNA that carries instructions for a trait, Allele, A version of a gene, Offspring, The young produced by parents, Phenotype, A trait we can observe or measure, Inherited trait, Beak depth passed through genes, Acquired trait, Learning to use a tool, Variation, Differences in traits between individuals, Drought, A long period with very little rain, Reproductive success, Surviving and producing offspring, Deeper beaks, Helped finches eat large, hard seeds

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