Question

question: describe a system or cycle you observed in the picture? (the cycle or system in the picture shows...first...second...third...) observe the below picture

Explanation:

The picture shows the cycle between photosynthesis and cell - respiration. First, in photosynthesis, plants use light energy, carbon dioxide ($CO_2$) and water to produce oxygen ($O_2$) and glucose. Second, in cell respiration, cells use oxygen and glucose to produce carbon dioxide, water and chemical energy. Third, the products of one process are the reactants of the other, creating a cycle.

Answer:

The cycle in the picture shows the relationship between photosynthesis and cell respiration. First, photosynthesis uses light energy, $CO_2$ and water to make $O_2$ and glucose. Second, cell respiration uses $O_2$ and glucose to produce $CO_2$, water and chemical energy. Third, the two processes are interconnected as the outputs of one are the inputs of the other.