This scatter plot visualizes the Iris dataset, plotting petal length against petal width, with each point colored by species (setosa, versicolor, or virginica) using a custom marker function. The visualization is built with D3 v6, using `scaleLinear` for both axes, `axisLeft` and `axisBottom` for chart framing, and loads the data from a remote CSV file via the `csv` function. Note that while the code also parses sepal dimensions, only the petal measurements are currently displayed. The chart is drawn as an SVG, with circles sized at a fixed radius and axes labeled in green.