The Struggle for Survival

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Across
  1. 1. A factor, such as a food, water, or space, that restricts the growth or distribution of a population.
  2. 3. A species at very high risk of extinction in the wild.
  3. 4. The study of the relationships between living organisms and between organisms and their environment.
  4. 6. All the organisms that live in a particular place, plus their physical environment.
  5. 8. A group of organisms of one species that interbreed and live in the same place at the same time.
  6. 9. The particular physical setting or surroundings where an organism lives.
  7. 12. A new species arriving from a different place, often non-native.
  8. 14. Non-living chemical and physical factors (e.g., temperature, water).
  9. 17. Factors created by a living component of the environment (e.g., disease, predation).
  10. 18. Competition between individuals of the same species.
  11. 20. An organism that occurs naturally in an area.
  12. 21. The struggle between organisms for the same resources within an environment.
  13. 22. The variety of life in the world or in a particular habitat or ecosystem.
  14. 23. An adaptation related to the actions or responses of an organism (e.g., migration, hibernation).
  15. 24. A specific part of the habitat that an organism occupies, its "role."
  16. 25. An adaptation relating to the inner workings of an organism (metabolism, venom, etc.).
  17. 26. The selection process by which organisms better adapted to their environment tend to survive and produce more offspring.
  18. 27. A group of interdependent organisms inhabiting the same region and interacting with each other.
Down
  1. 2. Competition between individuals of different species.
  2. 5. The capacity of an environment to sustain a maximum number of individuals of a given species.
  3. 7. The ability of an organism to survive and reproduce in its environment.
  4. 8. The eating of one organism by another.
  5. 10. A relationship where an organism eats parts of a plant or alga.
  6. 11. An adaptation related to the physical shape or structure of an organism.
  7. 13. A species that is unique to a defined geographic location.
  8. 15. Changes in the vertical distribution of organisms, e.g., in a forest canopy.
  9. 16. Changes in the distribution of organisms across a horizontal area (e.g., up a mountain).
  10. 19. Organisms so similar that they can breed and produce fertile offspring.