This interactive scatter plot visualizes the Iris dataset, showing how sepal and petal measurements relate across three flower species. Users select which measurement maps to the X and Y axes via dropdown menus, with points color-coded by species and animated transitions when selections change. Built with D3 v5, it uses `csv()`, `scaleLinear()`, `axisBottom()`, `axisLeft()`, and `transition().duration()` to render SVG circles and axes.