Extended Response

A scientist wants to examine the effect of fertilizer on algal blooms. In the laboratory, the scientist adds increasing amounts of fertilizer to three samples of pond water and adds no fertilizer to a fourth sample of pond water.

Part A Which samples will show increased algal growth? Explain your answer.

Part B How can the scientist apply his or her laboratory results to a natural ecosystem? Compare the scientist's experiment to a natural ecosystem, such as a pond.

For a question involving experimental data, determine the constants, variables, and control before answering the question.

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