This bubble chart visualizes the correlation among flipper length, bill length, and body mass for penguins, with each circle’s position mapping flipper length (x-axis) and bill length (y-axis), while its radius encodes body mass. Color distinguishes penguin species, and hovering over a circle reveals a tooltip with the species and body mass. Built with D3 v7, the visualization uses `d3.scaleLinear` for axes and radius, `d3.scaleOrdinal` with `d3.schemeCategory10` for species colors, and SVG for rendering. Data is loaded from the `bubblechart.csv` file, which contains measurements for Adelie, Chinstrap, and Gentoo penguins.