This bubble chart visualizes the Iris dataset, plotting sepal length on the x-axis against sepal width on the y-axis, with each flower’s petal length controlling the circle’s radius. Species are color-coded using `d3.scaleOrdinal`, and hover tooltips display exact measurements. The visualization, rendered with SVG, includes axes with `d3.axisBottom` and `d3.axisLeft`, a legend, and a secondary circle reference for petal length. Data is loaded asynchronously from `iris.csv` using `d3.csv`.