This scatter plot visualizes the Iris dataset, plotting petal length against petal width, with points colored by species (setosa, versicolor, and virginica). The visualization encodes additional sepal dimensions as circle radii, using the `rx` and `ry` attributes. Built with React and D3 v3, it uses `d3.csv`, `scaleLinear`, `extent`, and `axisLeft`/`axisBottom` to render an SVG, with custom margins, axis labels, and a large canvas-sized layout.