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4 Written questions

3 Multiple choice questions

  1. The struggle among organisms for the limited resources in an ecosystem is called
  2. The relationship between humans and Escherichia coli bacteria in their intestines is an example of
  3. A relationship in which one organism benefits and the other is neither helped nor harmed is called

3 True/False questions

  1. sunlightWhich of the following is NOT a biotic factor?


  2. warning coloringThe largest population that an environment can support is called its


  3. treesAn organism's role in an ecosystem is called its