This scatter plot visualizes heart disease patient data from the UCI dataset, mapping age against maximum heart rate achieved. Users can dynamically change both axes via dropdown menus, selecting from quantitative variables like resting blood pressure or categorical options like patient sex. Built with D3 v6, the visualization uses `scaleLinear` and `scalePoint` for axis scaling, with smooth transitions animating circle positions and radii. The plot renders as SVG, with circles colored by patient sex (red for female, blue for male) and axis updates triggered through custom menu components dispatching change events.