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In a green plant

There are photosynthetic organisms beside plants(Cyanobacteria, etc.). The energy for photosynthesis comes from the Sun. There are also organisms that can get energy from chemicals. Such as chemicals released from hydrothermal vents. That energy may have ultimately came from other stars that exploded long ago(elements made in the core of those stars that is now generating heat in the Earth via nuclear decay). So for life as we know it all food starts with energy directly or indirectly from stars. That energy came from nuclear fusion of light elements. Those light elements came from the Big Bang.

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15y ago

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