Some animals, such as a cat and a dog, have many similarities.  Others, such as a fish and a bird, have fewer similarities.  What is TRUE about the ancestors of these animals?

  1. Cats and dogs share a common ancestor with each other, but fish and birds do not share a common ancestor with each other.
  2. Cats and dogs share a common ancestor with each other, and fish and birds share a common ancestor with each other, but cats and dogs do not share a common ancestor with fish and birds.
  3. Because cats, dogs, fish, and birds are separate species, none of them shares a common ancestor with any other.
  4. Cats, dogs, fish, and birds all share an ancient common ancestor. 
Distribution of Responses
Chart showing distrubtion of responses for Item EN046003
Students Responding Correctly
Group Correct Total Percent
Overall 268 1619 17%
Grades
  6–8 130 1056 12%
  9–12 138 563 25%
Gender
  Male13174518%
  Female12382215%
Primary Language
  English239146416%
  Other2010619%

View data table