Dna replication is called semiconservative because.

DNA replication is called semiconservative because the new DNA helices are formed by a new strand and an old strand, commonly called daughter strand and mother strand.

Explanation:

This happens as the DNA is replicated from the replication fork by the DNA-polymerase, using the old strands as templates to create the new strand with its complementary bases. This results on two double helices formed by an old and a new strand. This was proved by the experiment of Meselson and Stahl.

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the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.