So let's basically break down what these three steps actually involved. And let's begin with step number one, the strand separation. So suppose we have a beaker and inside that closed beaker we basically have all these different ingredients inside a solution. So we basically have the target DNA molecule that we want to replicate, we have the pairs of DNA primers, we have the heat resistant DNA polymerase and we also have the different types of deoxyribonucleotide triphosphate. So let's begin with step one. In step one, what we actually want to do is we want to increase the temperature so that we reach a temperature where the hydrogen bonds will break between those two DNA strands.