This interactive scatter plot visualizes the Iris flower dataset, displaying sepal and petal measurements as colored circles representing three species. Users select which quantitative attributes appear on the X and Y axes via dropdown menus. The visualization uses d3.csv to load data, d3.scaleLinear and d3.extent for scaling, d3.axisBottom and d3.axisLeft for gridlines, and d3.scaleOrdinal to map species to a viridis color palette. Circles are rendered as SVG elements with opacity, and axes include rotated labels for clarity.