This D3 scatter plot visualizes the classic Iris dataset by positioning each flower as a circle, with sepal length plotted on the y-axis and petal length on the x-axis. The circles are rendered as SVG elements using data-driven joins, with scales created via `d3.scaleLinear` and axes generated through `d3.axisLeft` and `d3.axisBottom`. The code loads the CSV data using `d3.csv`, parses numeric fields, and fills the entire viewport. Tick text is enlarged to 24 pixels for improved readability.