Question

Which two processes form a cycle, with the products of one process becoming the reactants of the other?

Answer 1

That would be photosynthesis and cellular(aerobic) respiration.

The products of photosynthesis(oxygen and glucose) are the reactants of cellular respiration which uses that to make CO2, water and energy(ATP)

Answer 2

Cellular Respiration and Photosynthesis

Step-by-step explanation:

Cellular respiration uses oxygen and sugar and turns it into water and carbon dioxide, photosynthesis uses water and carbon dioxide and turns it into oxygen and sugar.