PBS Learning Media is a wealth of digital resources for educators to bring 21st century skills into the classroom. Help students appreciate the critical role trees play in sustaining life on Earth with this interactive from the National Arbor Day Foundation.Did you know that a tree's rings can provide a record of the environmental factors that affected its growth and life cycle? The trunk of a tree functions as both a supporting structure and a pathway, transporting food down from the leaves through photosynthesis and conducting water and minerals up from the roots. View InteractiveIn this interactive activity adapted from the National Arbor Day Foundation, explore the intricate life of a tree. The trunk of a tree functions as both a supporting structure and a pathway, transporting food down from the photosynthesizing leaves and conducting water and minerals up from the roots. Look inside a tree to learn about the xylem, cambium, and phloem, and to see how the tree's rings provide a record of the environmental factors that affected its growth and life cycle.This media asset comes from the Arbor Day Foundation.