BIOL 1202 Chapter : Chapter 25 The History Of Life On Earth
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Antarctica now barren, used to be a land teeming with creatures. Past organisms are very different from those presently living. Section 25. 1 conditions on early earth made the origin of life possible. Macroevolution broad pattern of evolution above the species level. Adaptations: abiotic (nonliving) synthesis of small organic molecules (like amino acids and nitrogenous from the environment, origin of self-replicating molecules, packaging these molecules into protocells. Earth and other planets formed from a cloud of dust and rocks surrounding sun (this is bs) bases) Joining of monomers into macromolecules (proteins and nucleic acids: protocell droplets with membranes maintaining an internal chemistry different. 1st atmosphere of earth thick with water vapor & compounds released by volcanic. Hypothesized that earth"s early atmosphere was a reducing environment (e- adding) eruptions (n & oxides, co, methane, ammonia, hydrogen, and hydrogen sulfide) As earth cooled, the vapor condensed into oceans & the hydrogen escaped into space.
