This interactive scatter plot visualizes the Iris dataset, encoding multiple quantitative attributes via dropdown menus that switch the X and Y axes. D3 v6 scales (scaleLinear and scalePoint) map values to positions, while categorical variables use point scales. The reusable chart pattern uses selection.join with transitions, animating circles and axes over 1 second when data mappings change. SVG rendering displays semi-transparent circles that grow on entry, with axes drawn using d3.axisLeft and d3.axisBottom.