This scatter plot visualizes the Iris dataset, mapping petal length on the x-axis and sepal length on the y-axis. It encodes individual flowers as circles rendered in SVG, sized uniformly with a radius of 5 pixels. The example uses d3.csv to load the external CSV file, d3.scaleLinear with d3.extent for continuous scales, and d3.axisLeft and d3.axisBottom to generate the axes. The chart adapts to the viewport by sizing the SVG to the window’s inner width and height.