Before mitosis begins, a cell makes a copy of the dna in the nucleus. what term is used to describe this process of making an exact copy of the dna?

Replication

Explanation:

The process through DNA makes an exact copy of itself is known as replication. During reproduction organism passes its genetic information to its young ones by replicating and transferring the DNA. During replication, the double helix unwinds and the base pair separate. On the parent strand, enzymes move and read the bases and thereby produce a copy of it.  

The strands of DNA re-twist and produce two daughter molecules.  

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]