This interactive scatter plot visualizes the Iris dataset, letting users switch both axes between sepal and petal measurements or categorical species. The D3 v6 code builds reusable `menu` and `scatterPlot` components, using `scaleLinear` and `scalePoint` for quantitative and categorical axes. When a menu changes, `selection.join` animates circles and axes via `transition`, with circles fading in and repositioning to reflect the new dimensions. SVG rendering with opacity-controlled points reveals data density.