Oparin-Haldane theory

The Oparin-Haldane theory suggests that life on Earth began in the ancient oceans through a gradual process. In the early Earth's environment, simple molecules like water, methane, ammonia, and hydrogen formed. Energy from sources such as lightning and volcanic activity triggered chemical reactions, creating more complex organic compounds like amino acids—the building blocks of life. Over time, these molecules accumulated and organized into self-replicating, living systems, eventually leading to the emergence of the first primitive organisms. This theory highlights how life could have arisen naturally from non-living chemicals in Earth's early conditions.