The answer is high pressure. In a nuclear reaction process, high temperature and high pressure is required for turning hydrogen nuclei into a helium nucleus. It is impossible for it to happen simultaneously because it requires tremendous amounts of energy. Extreme conditions are required for the atoms to overcome electrostatic repulsion.
use of commercially produced fertilizers
Note: industrial revolution to agriculture
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The correct answer to this open question is the following.
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The process that describes how missionary activities changed the geographies of universalizing religions outside of their founding hearths was Expansion Diffusion.
This is the process that happens when a major nation introduces and expands its culture, tradition, customs, or religious beliefs into other nations. It could be through conquering and colonizing as was the case of the Spanish crown which sent its religious congregations such as the Franciscans to evangelize the Native Indians into the Catholic religion.
It's 7 kilometres from earth in light years