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how to inject xanax When Pespeni looked at the animals??? genes, however, she discovered a big difference. In both groups, the young larvae showed lots of genetic variation. That variation persisted throughout the study for urchins exposed to normal levels of carbon dioxide. However, as the urchins in the more acidic water grew older, certain alleles ??? different versions of genes ??? became more common. Genes that regulate aspects of growth and the control of acidity appeared most affected.