This example visualizes the Iris dataset, showing each flower’s sepal length against its sepal width as a point on a scatterplot. The chart uses React to render SVG circles via a custom `Marks` component, with D3 scales (`d3.scaleLinear`) and axes generated by reusable `AxisBottom` and `AxisLeft` components. Data is loaded asynchronously from a CSV file using `useData` and `d3.csv`, and hoverable tooltips are provided through SVG `<title>` elements. The visualization emphasizes clean axes and labeled tick marks for readability.