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A species of fish is unintentionally introduced into a marine ecosystem. The species has a similar diet to an existing fish species, creating competition for food. Which of the following must occur for the existing species to be more resilient in the environment? (3 points)
Individuals within the existing species' population must evolve traits that provide a survival advantage.
Individuals should have less genetic diversity to become more similar and evolve in the same direction.
Natural variations in phenotype must be present in the existing species' population.
The existing species must reduce its rate of reproduction to produce only the most fit offspring.
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