Evolution is one of the greatest discoveries and widely debated topic in science. Afew schools of thought hypothesized several possibilities for the origin of life, but the original primordial organism is missing in all current theories, it is “unknowable” and scientifically far from having definition. Aroot of any phenotypic tree is characterized as the most common ancestor, which
is unknown. Even the RNA world hypothesis was not able to solve the “chicken – and - egg” problem. While defining evolutionary processes, one important fact is forgotten that all the organisms are made of molecules and there are several common molecules. The search of the origin of life or a better phrase, the chemical origin of life began in 1952. They simulated the early
atmosphere of the earth with a mixture of water, methane, ammonia, hydrogen, and lightening spark (Miller-Urey experiment). For the first time, this experiment presented a model of ‘primordial soup’ for the beginning of the life. It opened a window to the universe. Their experiment, along with considerable geological, biological, and chemical support, formulates a theory of
first life, which basically arose naturally from the simple chemical molecules and sustains through chemical reactions. The simple molecules created in the early atmosphere became the building blocks of life and started various types of chemical reactions necessary for the origin of the life. These precursor molecules became proteins, DNA and other biological molecules.
These macromolecules, originated from very simple molecules, assembled together into a simple cell, then into simple to complex organisms. These molecules take part in all reactions inside or outside of the cells. However, many of these reactions are the same, such as those that release or store energy. Additionally, the processes are similar and rely on the exact same
molecules. These molecules are widespread and termed as “molecular fossils”, such as ATP (adenosine tri phosphate). So, a more inclusive definition of evolution would include diversity in molecules. Diversity in species, organisms and biology comes later and can be defined as a subsequent state of molecular evolution.