The complementary strands of DNA to form a -shaped replication fork New pairs are formed according to base pairing rules Each double-stranded DNA is made of one strand and one strand of DNA

The complementary strands of DNA Unwind to form a _Y___-shaped replication fork New __Neucleotide base pairs are formed according to base pairing rules Each double-stranded DNA is made of one _old strand and one ___new strand of DNA

Explanation:

Central dogma is the process by which proteins are synthesized from genetic information. It comprises of replication, transcription and translation. In replication the new copy of DNA is synthesized.

The double stranded DNA is unwound by helicase enzyme.A primer is added by RNA polymerase to start replication by DNA polymerase.DNA polymerase can add the nucleotides in only in 5' to 3' direction so it synthesizes one strand of DNA continuously known as "leading strand" and  one strand in fragments known as "lagging strand"Ligase enzyme join the fragments of lagging strand.The new DNA molecule contains the one old strand and one new strand

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.