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 predicts an observable result related to the question. Choice A predicts that tomato plants given phosphorus will produce more tomatoes, which can be tested by comparing their fruit production with plants that do not receive phosphorus. The other choices focus on leaf size, taste, or when to add phosphorus rather than directly testing fruit production.

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