A scatterplot of Body Mass Index by gender from the CDC Dataset, plotted against age. The chart uses circle glyphs to represent individuals, with color encoding gender, and displays data points across the age axis. The implementation relies on D3 v7 for data parsing, aggregation, and SVG rendering. It computes average sepal length per species using `flatRollup` and `sum` from d3, though the visualization itself focuses on BMI distribution. The data is loaded asynchronously via `fetch`, parsed with `csvParse`, and rendered within an SVG container.