A, because if there are less Eagles in a ecosystem, then there would be more snakes because they wouldn't be eaten.
The sudden decrease in eagle populations in a grassland ecosystem will likely result in an increase in the population of snakes, as there will be less predation. This allows snakes to thrive, potentially affecting other species and plant life as well. Therefore, the correct choice is A: The ecosystem will become overpopulated with snakes.
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