Ch. 8 Changes in an Ecosystem

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Across
  1. 7. plants release water vapor into the air
  2. 10. plants and animals that originally live in an ecosystem
  3. 11. a regular pattern of change
  4. 13. gradual changes in the populations of organisms in an ecosystem
  5. 14. when water changes from a liquid to water vapor
  6. 15. any physical hazard to life caused by having too much or too little of things needed for life
Down
  1. 1. when water falls to earth either as a liquid or a solid
  2. 2. when water changes from water vapor to a liquid
  3. 3. organisms use sugar molecules and oxygen to produce energy
  4. 4. plants and animals that are not native to an area and can cause harm
  5. 5. plants use water, carbon dioxide, and sunlight to create sugar and oxygen
  6. 6. a population so small that it is in danger of becoming extinct
  7. 8. a species whose last known member has died
  8. 9. regular divisions of the year
  9. 12. precipitation that soaks into the ground and is stored