Abiogenesis is the scientific theory that suggests how life on Earth might have originated from non-living matter. It proposes that the complex molecules necessary for life, such as proteins and nucleic acids, could have formed through a series of chemical reactions in the early Earth's environment. The theory of abiogenesis is supported by several lines of evidence, which are discussed below.

1. Miller-Urey Experiment:
The Miller-Urey experiment conducted in 1953 demonstrated that the conditions of the early Earth's atmosphere, which was rich in water vapor, methane, ammonia, and hydrogen, could have produced simple organic molecules like amino acids. This experiment provided evidence that the building blocks of life could have formed spontaneously under the right conditions.

2. Organic Molecules in Space:
Observations of interstellar clouds and meteorites have revealed the presence of complex organic molecules, including amino acids and nucleic acid bases. These organic molecules could have been delivered to Earth through comets or meteorites, providing additional support for the possibility of abiogenesis.

3. RNA World Hypothesis:
The RNA World hypothesis suggests that life on Earth could have initially relied on RNA, rather than DNA, as the genetic material. RNA is capable of both storing genetic information and catalyzing chemical reactions. This hypothesis is supported by the discovery of ribozymes, which are RNA molecules that can function as enzymes, catalyzing important biochemical reactions.

4. Origin of Cellular Structures:
The emergence of cellular structures, such as lipid membranes, is another aspect of abiogenesis. Lipid membranes can self-assemble in water, forming compartments that can encapsulate and protect organic molecules. These compartments, known as protocells, could have provided a favorable environment for the origin of life.

In conclusion, the abiogenesis theory proposes that life on Earth originated from non-living matter through a series of chemical reactions. The Miller-Urey experiment, the presence of organic molecules in space, the RNA World hypothesis, and the origin of cellular structures all provide supporting evidence for this theory. While abiogenesis does not explain the origin of the universe or the ultimate source of life, it offers a plausible explanation for the emergence of life on Earth.