An interactive scatter plot of the Iris dataset lets users explore relationships between variables. Two dropdown menus, built with a reusable `dropdownMenu` function, select which attributes appear on the x- and y-axes. The visualization uses D3 v7's `scaleLinear` for numeric fields and `scaleBand` for the categorical "class" column, rendering points via `transition` animations. Axis labels update dynamically, and axes are drawn with `axisBottom` and `axisLeft`. The code loads data from `iris.csv` and scales circles with a radius of 10.