What you know trees need to grow and where they get it based on our class discussions so far?

"Like any other plant, trees need sun, water and nutrients for survival. There are three main parts to a tree: the roots, the trunk and the crown (branches and leaves), and each plays a part in helping the tree use the sun, water and nutrients. The roots absorb water and nutrients from the soil."

Explanation:

"The mass of a tree is primarily carbon. The carbon comes from carbon dioxide used during photosynthesis. During photosynthesis, plants convert the sun's energy into chemical energy which is captured within the bonds of carbon molecules built from atmospheric carbon dioxide and water"

Words to you:

Hope this helps! :))

they deliver oxygen to the blood

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.