Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.
A plant that has adapted to survive in dry conditions by developing specialized structures to conserve water, building on the fundamental properties of a plant that undergo photosynthesis and requires cell structure.
External reference — all senses of the word “Cactus” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.
Trace. Question. Emerge.