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    Campbell Biology in Focus
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    Exam 23: Broad Patterns of Evolution
  5. Question
    Which Life Form Has Been Present on Earth the Longest
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Which Life Form Has Been Present on Earth the Longest

Question 4

Question 4

Multiple Choice

Which life form has been present on Earth the longest?


A) jawed vertebrates
B) humans
C) microbes such as bacteria
D) single-celled eukaryotes such as protists

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