This interactive scatter plot visualizes the Iris flower dataset, displaying measurements of sepal and petal dimensions for three species. Users can switch the x- and y-axis variables via dropdown menus, which triggers a re-render of the visualization. The plot uses D3 v5 with `scaleLinear`, `scaleOrdinal`, and `axisBottom`/`axisLeft` to position circles, color-coded by species. Points animate into place using `transition().duration()` with staggered delays, and a legend notes each species' color.