Conlan wants to answer the question, “Does phosphorus affect tomato fruit production?” Which statement represents a hypothesis that he can test to answer his question?

A testable hypothesis should predict an observable result related to tomato fruit production. Choice D predicts that phosphorus-fertilized plants will produce more tomatoes, which can be tested by comparing their fruit counts with plants that do not receive phosphorus. The other choices focus on leaf size, when to apply phosphorus, or taste rather than the amount of fruit produced.

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