This scatter plot displays the classic Iris dataset, showing relationships between four flower measurements (sepal length/width and petal length/width) for three Iris species. Users can dynamically select which measurements appear on the x- and y-axes through dropdown menus, triggering a re-render of the visualization. The plot uses D3 v5 with `scaleLinear`, `axisBottom`, and `axisLeft` to generate axes with gridlines, while colored circles represent the three species—Iris-setosa, Iris-versicolor, and Iris-virginica—with a corresponding legend. Data is loaded from a CSV file using D3’s `csv` method.