Oparin-Haldane hypothesis

The Oparin-Haldane hypothesis suggests that life on Earth began in a primitive, prebiotic environment through natural chemical processes. Around 4 billion years ago, simple molecules in Earth's early oceans, such as water, methane, ammonia, and hydrogen, gradually reacted under the influence of energy sources like sunlight or lightning. These reactions produced more complex organic molecules, which then assembled into the first living organisms. This hypothesis provides a scientific explanation for how life could have originated spontaneously from non-living chemical components on the early Earth.