This interactive scatter plot visualizes the Iris dataset, displaying the relationship between two user-selected flower measurements (sepal length, sepal width, petal length, petal width) on the x- and y-axes. Points are color-coded by iris class using `d3.scaleOrdinal` with `d3.schemeCategory10`, and a color legend is rendered as an SVG group. Two dropdown menus allow the viewer to change the axes. The plot uses `d3.axisBottom` and `d3.axisLeft` with grid lines, and updates dynamically via D3's data join pattern.