This example visualizes the Iris dataset using two 3D scatter plots in a single chart. One trace maps bill length, bill depth, and flipper length, while the other compares bill length, bill depth, and body mass. The code loads CSV data via `d3.csv` and renders the interactive 3D scenes with Plotly’s `scatter3d` type and `Plotly.newPlot` API. Marker styling includes size, opacity, and line properties.