A scientist thinks that a certain chemical is a mutagen. She exposes plant cells to a large amount of this chemical in the laboratory. Which statement best provides evidence that the substance is a mutagen?

A mutagen causes changes in genetic material. Evidence that the chemical is a mutagen would be a change in the plant cells that is inherited by their descendants, as described in choice B. Faster growth or unchanged division does not show a genetic change, and cell death alone does not establish that the chemical caused a mutation.

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