Visualizing Tree for Plant Species
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This example visualizes a hierarchical tree of plant species, showing the branching relationships between flowering plants like tulips and roses, and non-flowering plants such as ferns and mosses. The D3.js tree layout organizes nodes horizontally by depth, while SVG circles and green links represent each species and its connections. Clicking a node triggers an animated collapse or expansion of its children using D3's transition system. The code uses `d3.layout.tree`, `d3.svg.diagonal`, and `d3.selectAll` with 750-millisecond transitions for smooth interactivity.
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