This scatterplot visualizes the Iris dataset, plotting sepal length against sepal width for individual flowers. Each circle represents a sample, with opacity to reveal overlapping points and native SVG tooltips showing exact values on hover. The visualization is built with React and D3 v5, using `d3.scaleLinear` for axes, `d3.extent` for domain calculation, and React components like `AxisBottom`, `AxisLeft`, and `Marks` to render the SVG. Data loads asynchronously via `d3.csv` from the United Nations World Population Prospects 2019 gist.