Why is it important for dna to be duplicated before mitosis?

It is important for DNA to be duplicated before Mitosis as Mitosis is creating a duplicate daughter cell of the same parent cell by ending with cytokineses, splitting the cytoplasm and the replicated DNA. If the DNA is not duplicated, the new daughter cell would lack the DNA to perform it's duty.

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image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

b a mature ovary of a plant.