A reusable D3 scatter plot animates through the Iris dataset, cycling the x-axis between petal width, sepal width, petal length, and sepal length every two seconds while the y-axis remains fixed on sepal length. Built with d3.scaleLinear, axisLeft, and axisBottom, the chart uses SVG circles and a setInterval-driven re-render to update axes and marks. The data loads via d3.csv from a GitHub Gist.