Which of the following accurately pairs the phase of the cell cycle with its primary purpose? a. s phase–dna replication b. g2 phase–cell growth before dna replication c. m phase–cell growth before dna replication d. g1 phase–cell division

The correct answer is option A, S Phase - DNA Replication

The DNA replication begin at the S phase of the cell cycle. In this phase, the cell grows and prepare itself for the DNA replication while the other components such as centro some undergo replication. The S phase occurs during the inter phase and the genetic material duplicates itself before entering the mitosis and meiosis cell division in the next stage.  

i think it is dna, i'm not totally sure but i think it might be.

its temperature is increasing. this causes molecular vibrations to increase.