This interactive tree diagram visualizes a hierarchical classification of organisms, from the root “Organisms” down to categories like Eukaryotes, Prokaryotes, and their children. Built with D3 v3, it renders nodes and links as SVG elements with collapsible branches, color-coded types, and tooltips on hover. The layout uses `d3.layout.tree` for positioning, while drag, zoom, and click behaviors support navigation. Data comes from a static `Tree.json` file, and animation transitions nodes when the tree updates.