What are two ways that proteins can impact the cell cycle and cause cancer

there can be mutations in the cell cycle that cause uncontrollable growth in the cells.

and this can cause tumors in the body with the uncontrollable growth of the cancer cells

the answer is a or when it says crossing over

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.