This interactive scatter plot visualizes the Iris dataset, showing measurements of sepal and petal length and width for three iris species, with each species distinguished by color. The visualization uses d3.scaleLinear, d3.axisBottom, and d3.axisLeft to render the plot as SVG circles. Users can select any of the four measurement variables for either the x-axis or y-axis through dropdown menus built with d3.select and d3.merge, which triggers complete re-renders via the render function. A legend displays the species color mapping using d3.scaleOrdinal.