This scatter plot visualizes the Iris dataset, mapping petal length on the x-axis and petal width on the y-axis, with each point colored by species (setosa, versicolor, or virginica). The plot also encodes sepal length and width as additional attributes on each circle, though these do not affect the visual radius. Built with D3 v6, the code uses `d3.csv` to load data, `d3.scaleLinear` and `d3.extent` for scaling, and `d3.axisLeft` and `d3.axisBottom` to render axes. The SVG circles are created via `selectAll('circle').data(marks).join('circle')`, with static labels for both axes.