Biology Regents Practice Exam

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What role do predators play in an ecosystem?

  1. They solely decrease prey populations

  2. They have no impact on biodiversity

  3. They help regulate prey populations

  4. They create competition among other predators

The correct answer is: They help regulate prey populations

Predators play a crucial role in regulating prey populations, which is vital for maintaining the balance of ecosystems. By controlling the number of prey species, predators prevent overpopulation and the subsequent depletion of resources, such as food and habitat. This regulatory effect helps to ensure that prey populations remain sustainable, promoting a healthy ecosystem. Additionally, the presence of predators can encourage prey species to behave differently, such as altering their feeding patterns and habitat use, which can lead to greater biodiversity. Predators contribute to the structure of the food web by maintaining the population dynamics within the ecosystem. This intricate balance fosters a more diverse environment, allowing various species to thrive without any one group dominating the landscape.

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