Organic molecules with the carbon atom at their centre make up all living things on the earth. Because of this, it is likely that organic molecules developed earlier than cells, maybe 4 billion years ago.
The earliest organic molecules were relatively basic carbon-based compounds with few atoms. These molecules then merged to create more complex molecules by joining forces with other simple molecules. More complex and stable molecules created over many years and most likely billions of trillions of chemical events.
According to scientists, chemical reactions in the early atmosphere of Earth were initiated by lightning. Gases including ammonia, methane, water vapour, and carbon dioxide were present in the early atmosphere. This, according to scientists' theories, turned inorganic substances into a "soup" of organic molecules.
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