This interactive D3 visualization demonstrates the Iris flower dataset through a customizable scatter plot. Users dynamically select which measurements (sepal length, width, petal length, or petal width) to display on the x- and y-axes via dropdown menus. The plot renders circles colored by Iris species, with a categorical color legend and animated transitions when axes change. Built with D3 v5, it uses `scaleLinear`, `scaleOrdinal`, `axisBottom`, `axisLeft`, and `transition()` to smoothly animate the scatter points.