Each learning path is one chapter: a guided route through a topic, one small course at a time. Pick a class to see its chapters in order.
Cut a stem and look through a microscope: inside there are tubes that carry water, tubes that carry food, and cells that give strength. Anatomy is the study of this inner plan. In this chapter you meet the tissues of a plant, how they are arranged into systems in the root, stem and leaf, and how a tree grows thicker year after year. Python counts the rings of a trunk.