What is the function of the G1, G2, M Checkpoints and the go-ahead signals involved in the cell cycle control system? Explain.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms

answerbacterium;