Ejercicio 6 - v2
This visualization displays the relationship between fertility rate and life expectancy across countries for the year 1983. Each circle represents a country, with its position determined by these two variables and its size scaled to population. The chart uses color to differentiate world regions, and includes a legend and labeled axes with gridlines. Built with D3 v5, it loads data from a CSV file, employs scales such as `d3.scaleLinear`, `d3.scaleSqrt`, and `d3.scaleOrdinal`, and renders the result as SVG circles.