A D3 scatter plot displays the Iris dataset, mapping petal length to the x-axis and sepal length to the y-axis using linear scales and axis generators. Each flower is rendered as a circle with a fixed radius of five pixels. The visualization fills the browser window by sizing the SVG to the viewport dimensions. It loads CSV data with `d3.csv`, parses numeric fields, and uses `scaleLinear`, `extent`, `axisLeft`, and `axisBottom` to construct the plot.