This animated scatter plot visualizes the Iris dataset with interactive menus for selecting different measurement variables. Built with D3.js v6, it uses a reusable chart pattern with `d3.scaleLinear` for scales, `d3.axisBottom` and `d3.axisLeft` for axes, and `d3.transition` to animate updates when menu selections change. The SVG rendering includes dynamic circle positioning and axis transitions, demonstrating the selection.join pattern for smooth data-driven updates.