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4 Written questions

4 Multiple choice questions

  1. Free nitrogen can not be used so it has to become fixed. Bacteria perfoms this function.
  2. Occurs where no previous ecosystem existed. First species to appear are lichens and mosses.
  3. First life was unicellular, did not need oxygen, were consumers, and lived in oceans. Formed by chemical units.
  4. Occurs after a disturbance in an already existing ecosystem. First species to appear are weeds/grasses.

3 True/False questions

  1. PredatorAnimal that gets eaten.


  2. ScavengerAnimal that gets eaten.


  3. Water CycleDriven by the sun. Changes from liquid to gas to liquid again.