Which of the below are required in an ecosystem in order for nutrient cycling to take place?
A. producers and decomposers.
B. producers, primary consumers, and decomposers.
C. producers, primary consumers, secondary consumers, and decomposers.
D. producers.

thats not even an aswer choice

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.