An interactive scatter plot visualizes the classic Iris dataset, mapping sepal and petal measurements to the x and y axes. The visualization offers two dropdown menus that let users change which flower attribute is displayed on each axis. The code uses D3 v5 to load the CSV data, create linear scales, and render SVG circles that transition to new positions with a one-second animation. Points are colored by iris species (setosa, versicolor, or virginica), with a legend and axis labels rendered via `d3.axisBottom` and `d3.axisLeft`.