This visualization uses the Iris Dataset to show how sepal and petal measurements relate across three iris species. It displays petal length on the x-axis, petal width on the y-axis, and sepal length as the size of each circle. Species are encoded by color, with setosa in blue, versicolor in red, and virginica in black. Built with D3 v6, the example uses `d3.csv`, `d3.scaleLinear`, `d3.scaleSqrt`, and SVG circles with tooltips to reveal exact values on hover. Axes are rendered using `d3.axisLeft` and `d3.axisBottom`.