This interactive scatter plot visualizes the Iris dataset, showing the relationship between petal length (x-axis) and sepal width (y-axis). A dropdown menu lets users change the x-axis attribute among sepal length, sepal width, petal width, or species. The chart uses D3's `scaleLinear` for both axes and renders SVG circles via React. The `extent` function computes the domain, and `format('.2s')` tick labels abbreviate large numbers with a 'B' suffix. Styling uses the Zen Loop cursive font.