DNA replication is considered semiconservative because

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Semiconservative DNA replication means that each daughter DNA molecule consists of one old parental strand and one newly synthesized strand. This was first demonstrated by the Meselson-Stahl experiment in which bacteria were grown in a medium containing a heavy isotope of nitrogen (15N) that was incorporated into their DNA. The bacteria were then transferred to a medium containing a lighter isotope of nitrogen (14N) and allowed to replicate their DNA. After one round of replication, the DNA was observed to band at an intermediate density, indicating that each new DNA molecule had one heavy strand and one light strand. This supported the semiconservative model of replication.

DNA Replication Is Considered Semiconservative Because