This visualization displays the classic Iris dataset as a scatter plot, mapping petal length and width on the x- and y-axes while coloring each point by species. It uses D3 v6 with `scaleLinear`, `extent`, and `axisLeft`/`axisBottom` to construct the plot. The code also reads sepal measurements for each datum but does not use them visually. Data loads asynchronously via `d3.csv` from a gist URL, and circles render in SVG with fixed radius, colored blue, red, or black for the three iris species.