Bio Chapter 4 Review

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Across
  1. 3. ______ gasses - said to cause global warming
  2. 6. amount of variation in an ecosystem
  3. 7. realistic model of growth
  4. 8. keeps the earth in balance
  5. 9. cycle that includes farm fertilization
Down
  1. 1. using organisms to clean up hazardous stuff
  2. 2. very rapid rate of growth
  3. 4. ______ factor - limits the growth of a population
  4. 5. cycle that includes evaporation and precipitation