This interactive scatter plot displays the classic Iris flower dataset, allowing users to explore relationships between sepal and petal measurements across species. Two dropdown menus, built with a custom `d3.dispatch`-based menu component, let viewers select which measurement appears on each axis. When a selection changes, the visualization animates smoothly, with circles transitioning to new positions using `d3.transition`. The chart is rendered as SVG, with axes and circles updated dynamically, while colors encode species using `d3.scaleOrdinal` with `schemeCategory10`. Hovering temporarily enlarges circles via CSS.