This interactive scatter plot animates through different x-axis variables—petal width, sepal width, petal length, and sepal length—while keeping sepal length on the y-axis, using the classic Iris dataset. Circles are colored by species (setosa, versicolor, virginica) with a custom legend, and the plot updates every few seconds via `setInterval`. Built with D3 v6, it uses `scaleLinear`, `axisLeft`, `axisBottom`, and a custom `scatterPlot` function, rendering as SVG with appended axis labels and a rotating title.