What do scientists find out when they trace the ancestors of dogs and cats?

  1. All dogs and cats living today share a common ancestor with each other that lived a very long time ago.
  2. All dogs share a common ancestor with each other, and all cats share a common ancestor with each other, but cats and dogs do not share a common ancestor with each other.
  3. Some dogs share a common ancestor with some cats, but all cats and dogs do not share a common ancestor with each other.
  4. Scientists cannot trace the ancestors of any two species back far enough to find out whether they had a common ancestor with each other.
Distribution of Responses
Chart showing distrubtion of responses for Item EN049002
Students Responding Correctly
Group Correct Total Percent
Overall 1199 4505 27%
Grades
  6–8 633 2744 23%
  9–12 566 1761 32%
Gender
  Male630215229%
  Female550226324%
Primary Language
  English1058399426%
  Other11140128%

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