The answer is Nitrogen fixation
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Karen is NOT correct. This is because the sun's energy is a renewable resource. This means that its use is sustainable hence it is a substance of economic value that can be replaced or replenished in the same or less amount of time as it takes to draw the supply down. Though the sun is a finite resource, it cannot be depleted within human timescale.
When you eat your food it travels to your stomach. The humans stomach acid is one of the strongest acids in the entire world. That being said, the food is broken down by this acid. Some foods don’t get broken down and go into your intestines. Your intestines break down the good even more and the leftover is turned into waste.
Photosynthesis is when light energy is converted to chemical energy. The plants takes in carbon dioxide and water. This transforms it into oxygen and glucose. The chlorophyll absorbs energy from the light and converts to chemical with water.
Ancient Greece brought the form of government called democracy