Which of the following was used to label DNA by Meselson and Sthal in their study on the mechanism of DNA replication?
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Meselson and Stahl used the stable heavy isotope $^{15}\text{N}$ (density-based tracking), whereas Hershey and Chase used radioactive isotopes $^{32}\text{P}$ and $^{35}\text{S}$ to prove that DNA is the genetic material.