This scatter plot visualizes the Iris dataset, using petal width and sepal length as the x and y axes, with points colored by species (setosa, versicolor, virginica). The visualization is built with D3 v6, using the `scaleLinear`, `scaleOrdinal`, and `axisBottom`/`axisLeft` APIs to render axes and a legend. A JavaScript `setInterval` cycles through four column pairings every two seconds, animating the plot to show different variable combinations while the SVG circles update smoothly. The data is loaded from a GitHub Gist CSV file and parsed into numeric fields.