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Jean Baptiste LamarckJean Baptiste Lamarck believed that if an animal began using an organ more than it had in the past, the size of that organ would increase during its lifetime. For example, if a giraffe stretched its neck to reach higher leaves, a "nervous fluid" would flow into its neck and make it longer over time. Gregor Johann MendelGregor Johann Mendel was the first to conduct detailed experiments in heredity by focusing on individual characteristics within a single plant species. His 30-plus years of study resulted in his discovery of genes, and of how those genes combine to create a wide diversity of characteristics.

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