The best definition of recombinant DNA is the following: Recombinant DNA is the DNA that includes pieces from two different sources. It is the combination of genetic material , a process of <span>creating sequences that would not otherwise be found in the genome.</span>
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The advantage of multicellularity, when compared to unicellularity is that the life span of organisms is higher in the case of multicellular organisms since they have a large number of cells to maintain various functions than the unicellular organism.
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