Sexual reproduction leads to genetic variation because the sperm and egg that are produced contain different combination of genes than the parent organisms. sexual reproduction involves meiosis which is in the process of a cell doubling its DNA.
I believe two individual new cells.
DNA helicase is the enzyme that opens the double helix
Abundant (now I'm just adding characters)
I think number 7 is "theory", but it could also be "conclusion"
11 sounds like "product(s)"
