Which of the following is the correct sequence of events in the origin of life?
I. Formation of protobionts
II. Synthesis of organic monomers
III. Synthesis of organic polymers
IV. Formation of DNA-based genetic systems

The correct sequence is:
II. Synthesis of organic monomers: The primordial Earth was rich in inorganic compounds, such as water, methane, ammonia and carbon dioxide. These compounds were exposed to various forms of energy, such as lightning, UV radiation and volcanic activity, which caused them to react and form simple organic molecules, like amino acids, sugars and nucleotides.
III. Synthesis of organic polymers: Once these simple organic molecules were formed, they started to react with each other to form more complex organic molecules (polymers). For example, amino acids can join together to form proteins and monosaccharides can form polysaccharides.
I. Formation of protobionts: Protobionts (e.g., coacervates and microspheres) are believed to have arisen
Spontaneously from organic molecules present in the primordial soup. These structures were not true living cells. They were aggregates of molecules that possessed some of the key characteristics of life, such as the ability to maintain an internal environment and replicate themselves.
IV. Formation of DNA-based genetic systems: As the protobionts continued to evolve, some of the molecules within them developed the ability to replicate themselves. These self-replicating molecules provided the basis for the first genetic material, which eventually evolved into DNA and RNA.Over time, the protobionts became more complex and evolved into the first living cells.