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In a heated debate in biogeography, the field is divided between dispersalists and vicariancists. There are those who argue that dispersal is the most crucial determining factor in a species' distribution, and those who insist that vicariance (separation due to geographic barriers) is. Biogeographer Isabel Sanmartin counts herself among neither. __________, she believes that both factors play important roles.<br/><br/>Which choice completes the text with the most logical transition?