This D3.js scatterplot visualizes the relationship between age (in years) and weight (in pounds) using CDC health data. The plot encodes each individual as a circle, with x-coordinates representing age and y-coordinates representing weight, using linear scales for both axes. The visualization employs D3's `csv` loader to parse the remote dataset, `select` to manage the SVG container, and `scaleLinear` to map data values to screen coordinates. The code constructs the chart with `axisLeft` and `axisBottom`, and renders all data points as SVG circles.