<human>:  What are the main steps of DNA replication?
<bot>: 
1. The double-stranded DNA molecule is "unzipped" along its length, splitting the two strands of the double helix apart.
2. Each of the two single strands of DNA acts as a template for the production of a new complementary strand.
3. Free nucleotides bind to the template strands and DNA polymerase enzyme joins the nucleotides together forming two new double-stranded molecules of DNA.
4. The two double-stranded molecules are now identical to the original DNA molecule.