Which phase of the cell cycle begins after g1 phase is complete?

Interphase is composed of G1 phase (cell growth), followed by S phase (DNA synthesis), followed by G2 phase (cell growth). At the end of interphase comes the mitotic phase, which is made up of mitosis and cytokinesis and leads to the formation of two daughter cells.

Hope this helps :)

i am going to guess that it is co2.