$6575$C$$C

Bringing the temperature to $6575$C$$C allows the heat stable DNADNA polymerase an opportunity to extend the primers by adding nucleotides to the $33$ ends of each growing strand.Bringing the temperature to $6575$C$$C allows the primers to bind to the denatured DNADNA.Bringing the temperature to $6575$C$$C denatures the double$-$stranded DNADNA so that it dissociates into single strands.