This scatter plot visualizes the Iris flower dataset, showing relationships between sepal and petal measurements. Interactive dropdown menus let the user select which measurements appear on the x- and y-axes, redrawing the plot with D3 scales and axes. The code uses d3.csv to load the data, d3.scaleLinear for positioning, and d3.axisBottom/axisLeft for grid lines and tick labels. Circles are rendered as SVG elements with fixed red opacity. The visualization originates from the UCI Machine Learning Repository’s Auto MPG dataset, though the loaded data is the Iris dataset instead.