An interactive scatter plot of the Iris dataset rendered as SVG with animated transitions. Users select which numeric column (petal width, sepal width, petal length, or sepal length) drives the x and y axes via HTML dropdown menus. The visualization uses the reusable chart pattern with D3 v6's `selection.join` to handle enter, update, and exit states, animating circle positions and axes through `transition`. Data loads from a CSV via `d3.csv`, and point size grows from zero on initial appearance.