This example shows a scatter plot of penguin measurements, mapping flipper length on the x-axis and body mass on the y-axis. Each circle’s fill color encodes the penguin species (Adelie, Gentoo, or Chinstrap), while its horizontal and vertical radii encode bill length and bill depth, respectively. The visualization uses D3 v5 with SVG rendering, loading data from a CSV file via `d3.csv`. Axes are created using `d3.axisLeft` and `d3.axisBottom`, with scales from `d3.scaleLinear` and data extents from `d3.extent`; the code also labels both axes and the plot title.