This animated scatter plot displays the Iris dataset, showing how the relationship between sepal and petal measurements changes. Users select which variables to plot on the x- and y-axes via two dropdown menus at the top. Built with D3.js, the visualization uses reusable functions (`scatterPlot` and `menu`) to manage state and rendering. When a new variable is chosen, the circles and axes transition smoothly over one second using `d3.transition`, with data bound via `selection.join` for enter, update, and exit handling. The SVG rendering uses linear scales and axis generators from D3.