Cycles
There are different types of cycles.
The water cycle provides the supportive environment in which life can exist. The bodies of all living beings are mostly water.
The nitrogen cycle provides a protein needed for cells to make their proteins and genes.
The carbon cycle provides an element needed for species to regulate their temperature.
The sulfur cycle provides an element needed to keep the global heating normal and for cells to grow.
The phosphorus cycle provides an element needed for cell membranes, genes, teeth, and bones.