This example shows the classic Iris Dataset as an animated scatter plot. Through dropdown menus, users can select which attributes (petal or sepal width/length, or species) to plot on the x and y axes. The menu module uses `d3.dispatch` to broadcast change events. The `scatterPlot` module leverages D3 6.7.0 features such as `scaleLinear`, `axisLeft`, `axisBottom`, and `transition` to animate point positions and axis ticks over one second.