Two students from the same class, studies different types of animals. Bill studied predators, while John studied grazers. Given the paragraph above, please answer correctly the following question: Which student found out that grazers on a grassland keep grass from growing out of control?
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Answer: John

A pharmaceutical company is trying to find the cure for allergy. To that end, they conducted an experiment with two groups of subjects, group A and group B. They exposed the participants in group A to allergen, but they didn't expose the participants in group B to any allergen. The symptoms of these two groups would help them find the cure for allergy. Given the paragraph above, please answer correctly the following question: In which group the immune system would make inflammatory response, group A or group B?
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Answer: group A

Two different rivers were stocked with adult fish. Red river had a lower fish population because the fish had hardly reproduced naturally. Black river had doubled it's fish population in two years because they reproduced naturally. Given the paragraph above, please answer correctly the following question: Which of the two rivers had fewer female fish release very high numbers of eggs to increase the chances of fertilization?
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Answer:
Red