This animated scatter plot displays the Iris dataset, with menus for selecting which quantitative or categorical attributes map to the x- and y-axes. D3's data join, with transitions, animates circles smoothly to new positions and scales as selections change. The code uses reusable chart and menu modules built on d3.js APIs, including `scaleLinear`, `scalePoint`, `axisBottom`, `axisLeft`, and `transition`. The visualization renders as SVG, and axes update with the selected columns.