This example displays the Iris dataset as a scatter plot of petal length against petal width, with each data point colored by species. It uses D3 v6 APIs including `csv`, `scaleLinear`, `extent`, `axisLeft`, `axisBottom`, and `select` to load the data, scale axes, and render SVG circles. Although the code defines `rx` and `ry` attributes from sepal measurements, the circles are drawn with a fixed radius, so the plot shows a standard clustered distribution.