This interactive scatter plot displays the Iris flower dataset, with dropdown menus letting viewers select which of four measurements to plot on the x- and y-axes. The visualization renders as an SVG using React components, with D3 scales (`scaleLinear`, `extent`, `max`, `format`) handling coordinate mapping. Axis components and marks are built from custom React functions, while the third-party `react-dropdown` library provides the selection menus. The chart updates dynamically when menu choices change, and hover tooltips reveal x-values through SVG `<title>` elements.