The Differences Between Marine and Freshwater Sticklebacks

Multiple Choice

The differences between marine and freshwater sticklebacks

A) are mainly induced by environmental conditions.
B) arise due to changes in the expression of a transcription factor.
C) are an example of genetic differences that do not cause phenotypic differences.
D) are the result of a mutation in a single population of freshwater sticklebacks.
E) probably have no selective advantages.