What is meant by semi conservative nature of DNA and who proposed it?

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The semi-conservative nature of DNA suggests the mode of DNA replication in which after the completion of replication, each new DNA double helix molecule retains (conserves) one of the two strands of the original DNA double helix.
During DNA replication, both the stands separate from each other and act as template for synthesis of new strands. So after DNA replication, two double stranded molecules of DNA are synthesised, each one with one parental strand (template) and the one newly synthesised strand.                
     
It was proposed by Watson and Crick.

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Semiconservative?replication would produce two copies that each contained one of the original strands and one new strand. Conservative replication would leave the two original template?DNA?strands together in a double helix and would produce a copy composed of two new strands containing all of the new?DNA?base pairs.

And was proposed by Meselson-Stahl experiments
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