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In an ocean ecosystem, seabirds are predators of fish. What would happen to the balance of an ocean ecosystem if the number of seabirds decreased? A. The population of fish in the ecosystem would increase. B. The population of fish in the ecosystem would decrease. C. The population of fish in the ecosystem would stay the same. D. The population of fish would disappear completely.

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Answer: The correct option is A.

Explanation: Seabirds are predators of fish in an ocean ecosystem. When the population of sea birds decreases, the population of fish in the ocean increases. This is because sea birds feed on the fish and fish population is controlled by sea birds whenever seabirds decrease in number, then very low amount of fish is required to feed the sea birds so automatically fish population is increased.

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