A marine biologist is diving near the seashore when she observes a gray fish resting on gray sand on the ocean floor. Later she notices another fish resting on the ocean floor in an area composed of small, variously colored stones. This second fish is identical to the first except that it is spotted instead of gray. The biologist continues her search of the area and collects 15 of the gray fish and 11 of the spotted fish.

After taking the fish back to her laboratory, she consults a reference book and discovers that the fish were identified as two separate species. She then places all of the fish collected into a large aquarium that has gray sand on the bottom. Several hours later she observes that all of the fish are now gray.

Which of the following would be the LEAST acceptable statement about these findings?

1) Gray fish tend to rest on a gray background.

2) The reference book was mistaken in identifying the two kinds of fish as separate species based on color.

3) Some fish can change color when they move to backgrounds of a different color.

4) The biologist had happened upon a small population of gray fish which could become spotted.

5) The biologist had happened upon a small population of spotted fish which could become gray.


How to answer this question:

  1. Consider each choice individually. In your response, present an argument for accepting or rejecting at least one of the options.

  2. Assume there is only one “correct answer”, so there would be one argument for acceptance and four for rejection.

  3. Several of the choices may be true statements, but may not apply to that particular problem. Therefore, picking the “right” answer is not sufficient; you must justify your choice with a rational argument.

  4. The emphasis is on evaluating evidence, identifying assumptions, drawing conclusions and making predictions exactly what you’ll be doing in your own projects this term.


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