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Across
  1. 3. An area of uncultivated ground where water collects.
  2. 6. Carbon accumulates in a/an _______.
  3. 8. A variable intentionally manipulated by scientists is a/an ________.
  4. 11. _______ means the state of being subject to death.
  5. 12. _______ a fine sand carried by water and deposited as sediment.
  6. 13. A sticky, fine-grained earth that form an impermeable layer in the soil.
  7. 16. _______ the number and abundance of a species.
  8. 17. The conditions surrounding a group of organisms is a/an ________.
  9. 21. The species to follow number y is known as _______ succession.
  10. 23. _______ is a fertile soil made of clay and sand.
  11. 25. _______ a symbiotic relationship in which both member species benefits.
  12. 26. _______ is a low-lying land that remains waterlogged.
  13. 27. A graphical representation of energy travel.
  14. 28. _______ growth
Down
  1. 1. _______ consists of marshes and swamps
  2. 2. _______ is the biochemical process by which plants produce energy.
  3. 4. Marine species made of microscopic plants.
  4. 5. _______ are a type of ecosystem characterized by the residing organisms.
  5. 7. The species to follow number z is known as _______ succession.
  6. 9. The ratio of births to size of population.
  7. 10. To protect from harm.
  8. 14. The first species to develop an uninhabited area.
  9. 15. Ability to conceive offspring.
  10. 18. A measurement of demands placed by humans on nature is known as a/an ________.
  11. 19. _______ a symbiotic relationship in which one member benefits and the second is unaffected.
  12. 20. A loose substance resulting from erosion that forms beaches, riverbeds and deserts.
  13. 22. The species to follow number x is known as _______ succession.
  14. 24. _______ partitioning is a practice in which species must share materials, resulting in direct competition.