Free Form during Origin of Life

During the origin of life, a variety of gases and compounds were present in the atmosphere, oceans, and on the Earth's surface. These gases and compounds were the building blocks for the formation of the first living organisms. The following were found in free form during the origin of life:

Ammonia
Ammonia (NH3) was present in the atmosphere during the early stages of the Earth's formation. It was formed from the reaction of molecular nitrogen (N2) and hydrogen (H2) under high-energy conditions. Ammonia played a crucial role in the formation of amino acids, which are the building blocks of proteins.

Methane
Methane (CH4) was also present in the early atmosphere of the Earth. It was formed from the reaction of hydrogen and carbon under high-energy conditions. Methane played a vital role in the formation of organic molecules, including amino acids, sugars, and nucleotides.

Hydrogen
Hydrogen (H2) was one of the primary gases present in the early atmosphere of the Earth. It was formed from the photodissociation of water vapor (H2O) and other molecules. Hydrogen played a crucial role in the formation of organic molecules, including amino acids, sugars, and nucleotides.

Oxygen
Oxygen (O2) was not present in free form during the origin of life. It was only produced by photosynthetic organisms, such as cyanobacteria, several billion years after the origin of life.

Conclusion
In conclusion, oxygen was not found in free form during the origin of life. However, ammonia, methane, and hydrogen were present in the atmosphere and played a crucial role in the formation of the first living organisms.