This visualization of the Iris dataset presents two complementary charts: a multi-series line chart tracks sepal length, sepal width, and petal length across all 150 samples, while a combined bar and line chart displays species counts alongside average petal width. The code uses D3.js v7 with SVG rendering, employing `d3.csv` to load data, `d3.line` for the line paths, and `d3.rollups` to aggregate species statistics. Hover effects on bars and custom color schemes enhance interactivity.