This example displays the Iris dataset as a scatter plot, cycling through petal width, sepal width, petal length, and sepal length on the x-axis while sepal length is fixed on the y-axis. Circles are color-coded by species. Built with D3 v6, it uses `scaleLinear`, `axisLeft`, `axisBottom`, and `setInterval` to animate the axis changes, rendering as an SVG.