Two dropdown menus control which Iris flower measurements appear on the scatter plot’s x- and y-axes, with labels updating accordingly. Built with React and D3 v5, the visualization loads the classic Iris Dataset via `d3.csv`, maps the numeric fields to linear scales using `scaleLinear` and `extent`, and renders SVG circles for each data point. The `Dropdown` and `Marks` components handle the interactive selection and circle placement, while formatted tick labels and axis titles clarify the currently chosen attributes.