Semi-conservative dna replication takes place during which phase

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.