This example shows an animated scatter plot of the Iris dataset with interactive dropdown menus to switch which flower measurements are plotted on the x and y axes. Built with D3.js and React, it uses `d3.csv` to load data, `scaleLinear` and `extent` for axes, and `transition` with staggered delays to animate circle positions between selections. The plot renders as SVG, with menus created via a custom `menu` function using D3’s `dispatch` for change events.