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When nitrogen-rich runoff from farms enters a nearby farm, it causes abundant growth of algal mat on the pond surface. As a result, underwater plants in the pond begin to die. Identify the limiting factor that is most responsible for causing the underwater plants to die.

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How would a drought most likely affect the plants of a grassy plain?

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Which of the following eras is known as the "Age of Mammals"?

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Which part of a plant is most responsible for using energy from the Sun to produce food for the plant?