This animated scatter plot cycles through different pairwise combinations of the Iris dataset’s four measurements, using petal width, sepal width, petal length, and sepal length as alternating axes. It uses D3’s `csv` loader and `scaleLinear`, `axisLeft`, `axisBottom`, and `select` to render circles colored by species (setosa, versicolor, virginica) with a legend. A `setInterval` timer updates the x-axis mapping, and the SVG output includes styled labels, a title, and explicit legend markers.