2.3

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Across
  1. 3. Process where beneficial traits become more common over time.
  2. 4. The amount of salt in water or soil.
  3. 6. Non-native species that spread and harm ecosystems.
  4. 7. Study of how species live and spread on islands.
  5. 8. An organism's ability to survive and reproduce.
  6. 9. Organisms that can live in many different conditions.
Down
  1. 1. A trait that helps an organism survive and reproduce.
  2. 2. Rapid evolution of many species from a common ancestor.
  3. 4. Organisms that survive in a narrow range of conditions.
  4. 5. The environmental limits an organism can survive within.