This scatter plot visualizes the Iris Dataset, mapping petal length and width for individual flowers while coloring each point by species. It extends the classic example by scaling circle radii according to sepal length and width, creating a fourth dimension of data. The visualization is built with D3 v6, using `csv` to load data, `scaleLinear` for axes, and SVG circles rendered via `selectAll` and `join`. Axis labels clarify the chart’s structure, and the code applies a custom `marker` function to assign distinct colors to the three flower species.