This visualization shows the average measurements of sepal and petal dimensions for three Iris species as a stacked bar chart, using a subset of the classic Iris dataset. The chart aggregates 150 data points into three bars, one per species, with each bar divided into four colored segments representing the mean sepal length, sepal width, petal length, and petal width. The visualization is rendered using D3.js v7, with the `d3.stack()` API to create the stacked layout and `d3.axisBottom` and `d3.axisLeft` for the axes. A legend identifies the color encoding for each measurement, while white strokes separate the stacked segments.