Answer:
Population pyramids are used by demographers as a tool for understanding the make-up of a given population, whether a city, country, region, or the world. Learning about, using, and understanding these pyramids is an important part of AP Human Geography and AP Environmental Science.
Explanation:
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<span>biogeochemical cycles</span>
Hydrogen. That is how it is continuing to heat, the Hydrogen atoms are fusing to form Hydrogen, but at this point the majority is Hydrogen, eventually it will be majorly Helium, then Carbon.