In a Long-Term Experiment at Hubbard Brook in New Hampshire

question 8

Multiple Choice

In a long-term experiment at Hubbard Brook in New Hampshire, scientists compared an undisturbed valley with a valley that had all the plants removed. What did they discover?

• A) Plants produce an important amount of oxygen in an ecosystem.
• B) Forests play a minor role in maintaining water quality, and only if it's very rainy.
• C) Forests play a major role in reducing water pollution from runoff and in maintaining soil fertility.
• D) Without plants, the animal population plummets, but this helps conserve water and nutrients in the system.
• E) Plants decompose very slowly and release their nutrients back to the soil.

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