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Previous research has shown that plant species with a narrow geographical range tend to be more genetically homogeneous than plant species with extensive ranges are. Based on these findings, researchers recently ran simulations to predict how the genetic variation of several species of Mammillaria , a genus of cactus found throughout the Americas, might change in different distribution conditions. One of these species, M. anniana, is found only in the state of Tamaulipas. The researchers simulated what would happen if M. anniana spread to new habitats outside Tamaulipas, and, consistent with previous findings, the results showed that_____