What is the best classification of the chemical?

Most of the carbon on earth is stored in the form of

What will happen if deforestation continue to destroy the green plant on the planet

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?