This interactive scatter plot visualizes the Iris dataset, displaying sepal length against petal length for three species of iris flowers. Each flower is represented by a distinct geometric shape (circle, square, or triangle) based on its species, with a shape legend in the upper right corner for reference. The visualization is built using D3.js v7 with a modular approach, leveraging `d3.scaleLinear` for the axes, `d3.scaleOrdinal` with `symbolsFill` for shape encoding, and custom modules for axis rendering and legend construction. The data is loaded from a remote CSV file and parsed using `d3.csvParse`.