This interactive scatter plot visualizes the Iris dataset, allowing exploration of relationships between sepal and petal measurements. Three Iris species are color-coded and rendered as semi-transparent circles using D3 v5’s scalable vector graphics. The plot uses `d3.select`, `d3.scaleLinear`, and `d3.extent` to map axes, while dropdown menus built with custom D3 selection logic let users dynamically choose which measurements appear on the X and Y axes.