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4 Written questions

4 Multiple choice questions

  1. Occurs after a disturbance in an already existing ecosystem. First species to appear are weeds/grasses.
  2. Free nitrogen can not be used so it has to become fixed. Bacteria perfoms this function.
  3. Driven by the sun. Changes from liquid to gas to liquid again.
  4. Animal that gets eaten.

3 True/False questions

  1. Food WebA food web has multiple (many) paths in which energy flows in an ecosystem. The arrow points in the direction energy goes!


  2. ScavengerEats animals that are already dead.


  3. ParasiteSurvives by stealing energy off another animal