Food chain is the answer.
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Variation means difference in genetic makeup between individuals within a specie.
The process of DNA replication begins with one double-stranded molecule of DNA. The two strands of this molecule separate during replication, and DNA polymerases add complementary nucleotides to each strand. The end results of DNA replication are two identical DNA molecules
DNA Helix, DNA Supercoils, Nucleosome, Chromosome
Small < Large
