The rotten spots seem to be getting a lot more dark and large. I'm wondering if it is just rotting, or if mold is growing. Or possibly they are the same thing. I always figured mold to be something that grows on top of something else, but the tomato seems to be actually changing somehow. If teaching a concept like this to the class, it may be helpful to give them some background knowledge of mold, and physical and chemical changes, so they may be able to better understand what is going on. Or to make it even more of an inquiry, not have them have an idea before, but to talk about it after so they can apply those concepts to the project.
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