HELP 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.

What will happen is the new  species  with out a natural predator will starve the other  species and they will have to adapt

Explanation:

( it might be wrong pls dont report me just let me kno y its wrong )

[A] Individuals within the existing species population must evolve traits that provide a survival advantage.

State that - "Individuals with adaptive traits—traits that give them some advantage—are more likely to survive and reproduce. These individuals then pass the adaptive traits on to their offspring. Over time, these advantageous traits become more common in the population."

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.