APES Unit 2

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Across
  1. 5. Tolerance The range of environmental conditions an organism can endure before stress, injury, or death occurs.
  2. 6. The recovery of an ecosystem after a disturbance, where soil is still present.
  3. 8. The gradual change in species over time due to genetic variation and natural selection.
  4. 9. Natural processes such as nutrient cycling, soil formation, and primary production that support life.
  5. 10. A sharp reduction in a population's size due to environmental events or human activities, reducing genetic diversity.
  6. 11. A species whose presence or absence reflects environmental conditions or ecosystem health.
  7. 13. Ecosystem functions that help regulate climate, water quality, and disease control.
  8. 15. Ecosystem services that provide goods such as food, water, and raw materials.
  9. 17. A stable, mature ecosystem that has reached the final stage of succession.
  10. 18. The division of large habitats into smaller, isolated sections, often due to human activities.
  11. 19. Biogeography The study of species composition and ecosystem dynamics on islands, including the effects of size and isolation.
  12. 22. The establishment of life in an area with no previous soil, such as after a volcanic eruption.
  13. 23. The total number of different species in an ecosystem.
  14. 25. A species that is naturally found in only one geographic area.
  15. 26. The natural, gradual change in species composition within an ecosystem over time.
  16. 27. A trait that enhances an organism's ability to survive and reproduce in a particular environment.
Down
  1. 1. Selection The process by which beneficial traits become more common in a population over generations.
  2. 2. A species that can survive in a wide range of environmental conditions and has a varied diet.
  3. 3. The variety of life in all forms, including genetic, species, and ecosystem diversity.
  4. 4. The variety of genes within a population that allows adaptation to environmental changes.
  5. 7. The benefits that humans obtain from natural ecosystems.
  6. 9. A species that thrives in a narrow range of environmental conditions and has a limited diet.
  7. 12. The number of different species in an ecosystem and their relative abundance.
  8. 14. Non-material benefits of ecosystems, including recreation, spiritual value, and aesthetic enjoyment.
  9. 16. A non-native species that spreads rapidly and disrupts ecosystems by outcompeting native species.
  10. 20. The variety of habitats within an ecosystem, supporting different species.
  11. 21. A species that has a disproportionately large impact on its ecosystem relative to its abundance.
  12. 24. The first species to colonize a disturbed or newly formed habitat, such as lichens and mosses.