Human Impacts on Ecosystems

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Across
  1. 2. a representation of a system
  2. 5. the study of the history of life on Earth using the fossil record
  3. 8. of, found in, or produced by the sea
  4. 11. the total number living in an area
  5. 12. when 75% or more of species go extinct in a short period we call it a _____ extinction
  6. 13. an element, rare on earth, found in high numbers during the Cretaceous extinction
  7. 14. evidence of life preserved in rock
  8. 16. self-contained underwater breathing apparatus
  9. 18. a photosynthetic organism that lives in coral
  10. 19. when all members of a species are no longer alive
Down
  1. 1. geologically speaking, "short" is two _____ years or less.
  2. 3. the variable that you decide to measure
  3. 4. a small animal that makes up part of coral
  4. 6. data represented not in numbers (i.e. color)
  5. 7. the number of different types living in an area
  6. 9. data represented in numbers
  7. 10. higher coral reefs reduce the height of _____
  8. 15. layers of sedimentary rock stacked up are called rock _____
  9. 16. the ability of a system to resist change
  10. 17. when coral lose their color we say that they are _____
  11. 20. the variable that "I" choose to change