Chemical evolution refers to the phenomenon defining the chemical changes on primitive earth followed by the first form of life. Research suggests that the first form of life in the primitive earth was prokaryotes resembles with the present form of bacteria. It has been estimated that the first form of prokaryotes evolved approximately 3.5-4.0 billion years ago.
It has been theorized that chemical evolution occurred in four successive stages –
• First stage – the molecules of the primitive world had turned into organic substances such as amino acid.
• Second stage – the simple form of organic substances (for example amino acid) accumulated to form more complex structure such as proteins. It then formed polymers by the method of dehydration synthesis.
• Third stage – this stage featured the interaction and aggregation of polymers to form large complex structure known as protobionts.
• Fourth stage – this stage was characterised by the development of the reproduction ability of protobionts in order to pass genetic information through generation.
It has been theorized that chemical evolution occurred in four successive stages –
• First stage – the molecules of the primitive world had turned into organic substances such as amino acid.
• Second stage – the simple form of organic substances (for example amino acid) accumulated to form more complex structure such as proteins. It then formed polymers by the method of dehydration synthesis.
• Third stage – this stage featured the interaction and aggregation of polymers to form large complex structure known as protobionts.
• Fourth stage – this stage was characterised by the development of the reproduction ability of protobionts in order to pass genetic information through generation.
