An animated scatter plot of the Iris dataset lets users switch between measurement combinations via two dropdown menus. Built as a reusable D3 v6 chart, it displays points as SVG circles with coordinated transitions for position updates and axis rescaling. The code uses `d3.scaleLinear`, `d3.extent`, `d3.axisLeft`, `d3.axisBottom`, and `selection.join` to handle enter, update, and exit states, with `d3.transition` powering the 1-second animations.