This interactive scatterplot visualizes the classic Iris dataset, comparing four floral measurements across three species. Users select which measurement to plot on each axis via dropdown menus. The D3.js code uses `scaleLinear`, `axisLeft`, `axisBottom`, and `scaleOrdinal` to build the chart, with circles transitioning from the center to their positions over a 2-second animation. A legend of colored dots identifies each species.