This interactive scatter plot cycles through four Iris flower measurements—petal width, sepal width, petal length, and sepal length—on the x-axis every two seconds while keeping sepal length on the y-axis. Built with D3.js, it renders each data point as a circle colored by species (green for setosa, grey for versicolor, brown for virginica) against a black background with white axes. The animation uses `setInterval` to update the x-axis scale and re-render the SVG, leveraging D3’s `scaleLinear`, `extent`, `axisLeft`, and `axisBottom` utilities.