As long as it contains two tablespoons of tomato paste, a slice of pizza counts as a vegetable in American public schools.

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Why Are Tomatoes Red?

Most tomatoes are red when they are ripe, because of the presence of lycopene, which is a phytochemical (a biologically active compound produced by plants). Immature tomatoes are rich in chlorophyll, another phytochemical, which gives them their green colour. As the seeds inside mature, the fruits