Final answer:
DNA replication is a semi-conservative process where each parental strand serves as a template for the synthesis of a new daughter strand. This was confirmed by experiments using density differences in nitrogen isotopes.
Step-by-step explanation:
DNA replication is a semi-conservative process. Each parental strand of DNA serves as a template for the synthesis of a new, complementary daughter strand. This results in two daughter DNA molecules, each consisting of one old strand and one newly synthesized strand. The semi-conservative nature of DNA replication was confirmed by the experiments conducted by Meselson and Stahl, who used density differences in nitrogen isotopes.