Testosterone oxido-reductase is a liver enzyme that regulates testosterone levels in alligators. One study compared testosterone oxido-reductase activity between male and female alligators from Lake Woodruff, a relatively pristine environment, and from Lake Apopka, an area that has suffered severe contamination. The graph below depicts the findings of that study.

The data in the graph best support which of the following claims?

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In comparison to the pristine lake, the female alligators in the contaminated lake have reduced enzyme activity. The males are not significantly different.