Why do scientists use controlled experiments

Scientists use controlled experiments because the results are consistent and can be replicated. The control of an experiment is the value that you are controlling the dependent variable to.

An experiment in which an observer tests a hypothesis by looking for changes brought on by alterations to a variable. In a controlled experiment, an independent variable is the only factor that is allowed to be adjusted, with the dependent variable as the factor that the independent variable will affect.

The right order is:

1. helicase unzips dna to separate strands.

2. topoisomerase unwinds the coiled dna.

3. primase lays down short rna strands.

4. polymerase synthesizes new dna strands.

5. the new strands are glued using ligase.