A student wanted to know the most effective way to grow bacteria in a lab. He conducted a descriptive investigation instead of an experimental investigation.What is a limitation of his investigation?

A descriptive investigation observes and records what happens, but it does not manipulate factors under controlled conditions. Therefore, it cannot establish that a particular factor causes bacteria to grow more effectively. Choice A correctly states this limitation; cost, amount of data, and background knowledge are not guaranteed consequences of using a descriptive investigation.

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