The first step in DNA replication occurs when the DNA molecule separates into two strands. What is the next step in DNA replication? DNA polymerase joins the individual nucleotides.
Enzymes break down the hydrogen bonds between base pairs.
DNA polymerase "proofreads" each strand to make sure the sequence is correct.
Enzymes produce two new complementary strands.

The initiation of DNA replication occurs in two steps. First, a so-called initiator protein unwinds a short stretch of the DNA double helix. ... Meanwhile, as the helicase separates the strands, another enzyme called primase briefly attaches to each strand and assembles a foundation at which replication can begin.

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brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

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