This interactive scatter plot visualizes the Iris dataset, showing how three flower species cluster across selected measurement pairs. Two dropdown menus allow users to independently choose which of the four features (sepal length, sepal width, petal length, petal width) appear on the x- and y-axes. The code uses D3.js v7 with SVG rendering, employing `scaleLinear`, `axisBottom`, and `axisLeft` to build the axes and gridlines. Circles are colored by species using a hardcoded color map, and the chart updates dynamically through the `render` function.