A scatter plot of the Iris dataset lets users compare any pair of measurement attributes—sepal length, sepal width, petal length, petal width, or species—by selecting them from two dropdown menus. The React app loads data via `d3.csv`, scales axes with `d3.scaleLinear` and `d3.extent`, and renders SVG circles for each flower. D3's `ticks` and axis components position gridlines and labels.