On the eastern islands, the tomatoes exhibited alkaloids similar to modern tomatoes, but on the western islands—which are geologically younger than the eastern ones—the tomatoes exhibited changes in four amino acids in the enzyme that makes these alkaloid molecules. The researchers theorize that the cause of this evolutionary quirk could be traced to the new, western islands themselves. While the eastern islands are millions of years old, the western ones are only hundreds of thousands of years old and are still forming today. It happened.”Whether organisms experience “reverse” evolution could largely be chalked up to semantics. With both cave fish and Galápagos tomatoes, evolution did its usual work of making life fit for the conditions at hand.