This visualization presents the classic Iris dataset as an interactive scatter plot, mapping petal length and width along the x- and y-axes. Each circle represents a flower, colored by species (green for setosa, purple for versicolor, red for virginica) using a custom marker function. Built with D3 v6, the code loads CSV data via `d3.csv`, scales positions with `scaleLinear`, and renders SVG circles using data joins. Axis labels display sepal length and petal width, while the plot dynamically sizes to the browser window. The example demonstrates fundamental D3 data binding and axis generation.