What happens during S phase

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

Question#29: why does the tropical ocean have a greater temperature range than the temperate ocean?