This interactive scatter plot visualizes the Iris Dataset, with dropdown menus that allow users to change which measurements are mapped to the x- and y-axes. The chart uses D3 v6 with SVG rendering and smooth 1-second transitions between states, animating circle positions and axis scales via `selection.join` and the `transition` API. The reusable chart pattern structures the code into modular functions for the scatter plot and menu, with the menu dispatching change events to update the plot's value accessors. Data loads from a CSV file hosted on GitHub.