This scatterplot displays the Iris flower dataset, plotting sepal and petal measurements and coloring points by species. Interactive dropdowns let viewers change which measurement is mapped to the x- and y-axes. The color legend responds to mouse hover, fading non-hovered species to 30% opacity while highlighting the selected group. Built with React and D3 v7, it uses `scaleLinear` for axes, `scaleOrdinal` for categories, and SVG circles for rendering.