This interactive scatter plot displays the classic Iris dataset, allowing users to compare any two of the four flower measurements (sepal length/width, petal length/width) by selecting them from dropdown menus. Each of the 150 data points is rendered as a colored circle, with hue indicating one of three Iris species. The visualization uses D3 v5’s `scaleLinear`, `axisBottom`, and `axisLeft` for axes, while `transition().duration().delay().attr()` animates the circles smoothly to their new positions when the axis selection changes. The legend and axis dropdowns are placed beside the plot.