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Rough-skinned newts produce a strong toxin called TTX as a defense mechanism against predators, Garter snakes
can tolerate a very limited amount of the toxin. However, several populations of garter snakes have recently shown
an increased tolerance for TTX. The different populations of snakes have independently acquired a gene variation
that allows them to better block the effects of the toxin
Rough-skinned newt
Garter snake
Which of these is most likely to increase in garter snakes?