In the Section "Investigating Life: Does Natural Selection Maintain Cystic

Multiple Choice

In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?",what is the dependent variable in the figure?

A) the number of defective copies of the CFTR gene in mice
B) the number of defective copies of the CFTR gene in humans
C) the amount of fluid in the intestines
D) whether or not the subjects were exposed to cholera toxin
E) whether or not the subjects were exposed to Vibrio cholera bacteria