This visualization shows a scatter plot of the Iris dataset, mapping petal length on the x-axis against sepal length on the y-axis using blue circles. The code loads the CSV data via `d3.csv`, parses numeric fields, and scales the data with `d3.scaleLinear` using `d3.extent` for domains. It renders SVG circles and adds axes using `d3.axisLeft` and `d3.axisBottom`, with the plot sized to fill the browser window.