This bubble chart visualizes the Iris dataset, plotting sepal length against sepal width for three flower species. Each circle’s size encodes petal length, while color distinguishes species. The visualization uses D3.js v7 with SVG rendering, employing `d3.scaleLinear` for axes and bubble sizing, `d3.scaleOrdinal` with `schemeCategory10` for color mapping, and interactive tooltips that appear on hover. Data is loaded via `d3.csv` from a GitHub repository, with styled circles that increase opacity and stroke width on mouseover.