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d. The farther away the bees5. Many plants and trees, with the help of a...

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d. The farther away the bees5. Many plants and trees, with the help of a nitrogen-fixing bacteria, take nitrogen from the air andconvert it into a usable form. A student wants to find out if the redbud tree helps to put nitrogen intothe soil. She designs an experiment in which she measures the amount of nitrogen in the soil aroundredbud trees and pine trees, before and after nitrogen-fixing bacteria are added to the soil.What is a logical hypothesis for the student's experiment?a.Redbud trees grow faster when soil nitrogen is present.b. Nitrogen-fixing bacteria populations grow faster when soil nitrogen is present.Redbud trees increase soil nitrogen levels with the help of nitrogen-fixingbacteria.C.d. Nitrogen-fixing bacteria increase soil nitrogen levels.

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