Answer the following questions based on Meselson and Stahl's experiment : <br> a. Write the name of the chemical substance used as a source of nitrogen in the experiment by them. <br> b. Why did the scientists synthesize the light and the heavy DNA molecules in the organism in the experiment? <br> c. How did the scientists make it possible to distinguish the heavy DNA molecule from the light DNA molecule? Explain. <br> d. Write the conclusion the scientists arrived at, after completing the experiment.

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