This scatter plot visualizes the Iris dataset, comparing petal length on the x-axis against petal width on the y-axis. Each circle is colored by species—setosa in skyblue, versicolor in lightgreen, and virginica in orange—with the selected sepal measurements also encoded as circle radii. The visualization uses D3 v6 with SVG rendering, loading remote CSV data via `d3.csv`, scaling axes with `d3.scaleLinear`, and drawing circles via `d3.selectAll` and `.join`. Axis labels are added using SVG text elements.