Which of the following experiments could test the hypothesis that bacteria cause ulcers in humans? (Assume each experiment includes a control group.) Explain what evidence would be provided by the results of the experiment.
a. Identify the microbes found in the stomachs of ulcer patients.
b. Treat a group of ulcer patients with antibiotics.
c. Place a group of ulcer patients on a strict low-acid diet.
d. Obtain stomach fluid from ulcer patents and feed it to mice.
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