You are constructing a diagram to show the cycling of matter (carbon dioxide and oxygen) and flow of energy in an ecosystem. Which of the following could be added to this diagram to show this process in more depth?

SELECT ALL THAT APPLY

A. An equal sign between the tree and human.

B. Distant mountains to show the full landscape of the area.

C. Arrows moving from the tree and human into the soil and back into the tree to show the action of decomposers.

D. An arrow flowing from the sun to the tree.