Well it helped the animals and humans grow the population.
Although there is no attachment, the best answer would be option B.
DNA replication occurs in opposite directions along a strand of DNA.
The leading strand is replicated continuously in the 5' to 3' direction towards the replication fork.
The lagging strand is replicated discontinuously in the 5' to 3' with segments of DNA known as Okazaki fragments.
Different forms of a given gene are known as "alleles". Alleles are essential for the formation of life and add to diversity both within and outside the organism itself in many ways.
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