This animated scatter plot visualizes the Iris flower dataset, cycling through four different x-axis measurements—petal width, sepal width, petal length, and sepal length—while keeping sepal length fixed on the y-axis. Each data point is colored by species (setosa, versicolor, virginica), with a static legend. The example uses D3 v6 APIs such as `scaleLinear`, `axisLeft`, `axisBottom`, and `setInterval` to update the chart, rendering SVG circles and text with a custom `scatterPlot` reusable function.