From heterotrophic to autotrophic, to solve this problem, we must know the original origin of life. Generally speaking, it is the following process: inorganic matter-small molecular organic matter (such as methane, etc.). )-polymer organic matter-polymer of polymer organic matter (primitive life). Therefore, life is not jumping out of inorganic matter, and the most primitive life is bathed in the ocean of organic matter, which is of course heterotrophic. Many students here mistakenly think that it is the most.

Because at the beginning of the origin of life, there was no evolution of autotrophic mechanism until the emergence of cyanobacteria. This kind of organism containing photosynthetic pigment begins photosynthesis, forms autotrophic mechanism and releases oxygen at the same time. Before that, there was almost no oxygen in the earth's atmosphere, and oxygen was a toxic gas to the living things at that time. Since then, with the mass production of oxygen, aerobic organisms have begun to dominate.

Life originated from water, and a large number of water-soluble compounds provide the possibility for the origin of life. At the same time, because there was no protection of the atmosphere at first, ultraviolet rays directly irradiated the surface of the earth, and only in water could they resist ultraviolet rays, so life originated from water. With the evolution, the competition of life in water became more and more fierce, so creatures began to March on land.