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A local population (e.g., Lake Erie water snakes) may fail to evolve adaptations to the local...

A local population (e.g., Lake Erie water snakes) may fail to evolve adaptations to the local environment because individuals adapted to a neighboring but different environment keep immigrating into the region. This illustrates which of the following?

drift-mutation equilibrium
drift-migration equilibrium
migration-selection balance
mutation-selection balance
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Answer #1

Migration selection balance because in this case migrated lake Erie water snakes adopted well to neighbouring, while the other suffers a migration from different environment make selection between locals.

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