This visualization shows a five-level hierarchical crop tree, from the root “Plants” down to specific crop leaves, using color-coded shapes to indicate depth. The D3.js v7 code builds an SVG with nodes and links, and includes interactive buttons to expand, collapse, and fit the tree to the view. Clicking on nodes toggles their children, while a legend and tooltip clarify the level colors. The layout and rendering rely on the SVG element, with no external simulation or layout algorithms visible in the provided code.