Spontaneous generation: life began from inanimate objects. Oparin’s theory: Alexander Ivanovich Oparin developed this abiogenic theory. 1.Components atmosphere (methane, ammonia, hydrogen and water vapour) reacted due to the energy of the storms, solar radiation and continuous volcanic eruptions creating simple organic molecules. 2.Earth cooled down, intense rain produced primitive seas, where organic molecules accumulated. 3.Organic molecules joined, creating bigger molecules; some of them were insulated from the water inside structures calles coacervates. 4. Some of the coacervates developed molecules in their interior that were able to self-replicating; these were the first organisims and the origin of all cells. Panspermia theory: life arrived from outer space as microorganisms trapped inside meteorites. Molecular panspermia: arrived organic molecules. Present.Day: primitive atmosphere (carbon dioxide, nitrogen, water vapour, sulphur dioxide and hydrocholic acid. One of the possible places in which living things could have first appeared are deep-sea hydrothermal vents. These places release inorganic matter that, along with water and carbon dioxide, formed the first organic molecules. Self-replication: molecules able to self-replicate and were surrounded by a lipid layer were formed, creating the first prokaryotic cells. Metabolism: lipid bubbles carry out chemical reactions were formed and later developed the ability to self-replicate. Fixism: living things do not change and therefore species always stay the same. Fossils showed different living things to those they could see, so they realized they must have come from other organisms that inhabited the planet sometime before them. George Cuvier was studying fossils and observed that most of them came from living things that had become extinct. He argued that there must have been several catastrophic events followed by periods of creation in the history of our planet. Evolutionary processes are slow, no understanding of genetics, confronting religious doctrines. Homologous organs: different function, same evolutionary origin. Divergent evolution refers to the changes from a common ancestor. Analogous organs: same function, different evolutionary origins. Convergent evolution refers to the changes that create similar structures in groups not related at all. Vestigial organs: tend to disappear not useful anymore because of changes in habits. Fossil evidence: evolutionary lineage. Fossils are evolutionary links. Organisms that have not change, or just very little are known as living fossils. Embryological evidence: embryos of different species are similar, there is an evolutionary relationship between them.