Question

Explain how the stem, the leaf, and the Roots work together for the benefit of the entire plant

Answer 1

Well, the leaves contain stomates, which let in CO2 and release O2. The roots collect water, which travel up the xylem, which are contained in the stem. 

Answer 2

The leaves get the energy it need and the roots gat the water the stim just spreads it around to help the plant grow hope this helps