Explain how the experiments carried out by Van Helmont and Calvin contributed to our understanding of how nutrients cycle in the biosphere.

Both Van Helmont and Calvin contributed to the understanding of photosynthesis. Van Helmont concluded that trees gain most of their mass from water. Calvin, on the other hand, t raced the chemical path that carbon follows to form glucose. These reactions are named the Calvin Cycle which is also known as Light-independent reaction and "Dark Reactions".