Final answer:
Countries like China, EU nations, and Japan have sub-replacement birth rates, whereas Nigeria has a high fertility rate. The US, India, and Mexico have intermediate fertility rates, while Russia, Brazil, and Germany are close to sub-replacement levels, indicating varying population growth challenges.
Step-by-step explanation:
To determine which countries have sub-replacement birth rates and which do not among the US, EU, Mexico, Russia, China, Japan, Canada, Nigeria, India, Brazil, and Germany, it's necessary to look at the fertility rates provided by authoritative sources such as the United Nations Population Fund and The World Bank database.
Countries such as China, most nations in the European Union (EU), and Japan are known to have low fertility rates, often falling below the replacement line. This indicates that these countries could experience population declines. Conversely, Nigeria and other nations in sub-Saharan Africa exhibit high fertility rates, leading to increasing population trends.
Some countries like the United States (US), India, and Mexico fall into the category of intermediate fertility rates. These countries are projected to experience moderate growth. Russia, Brazil, and Germany have witnessed decreasing fertility rates, approaching sub-replacement levels.
Understanding fertility rates is integral for comprehending population dynamics and potential future demographic challenges these countries may face.