Although there is uncertainty of how life originated, is generally accepted that prokaryotic life on earth about 3-4 billion years ago. There is not a lot of changes in cell morphology or organization that occurs in these organisms over several billion years into the futureEukaryotes is a major development in the evolution of cells. He came from ancient bacteria ingested by prokaryotic ancestors in cooperative association called endosimbiosis. Oral bacteria and host cells and then undergo evolution, the bacteria evolved into mitochondria or hidrogenosom. Ingestion separately in both organisms similar to cyanobacteria resulted in the formation of chloroplasts in algae and plants. It is not known when the first eukaryotic cells appeared, even though these cells appeared around 1.6 to 2.7 billion years ago.History still lives in the form of eukaryotes, prokaryotes, and single-celled arkaea until about 610 billion years ago, when multicellular organisms began to appear in the ocean Ediakara period. Multicellular evolution occurs in many separate events, occurring in diverse organisms such as sponges, brown algae, cyanobacteria, slime mold, and miksobakteri.Soon after the emergence of multicellular organisms, a large amount of biological diversity appeared over a period of more than about 10 million years in events known as Kambria explosion. At this time, the majority of modern animals appeared in the fossil record, as well as the lineage of extinct animals. Several drivers have been proposed Kambria explosion, including the accumulation of oxygen in the atmosphere from photosynthesis. Around 500 million years ago, plants and fungi colonize the land, and soon followed by arthropods and other animals. First amphibians appeared about 300 million years ago, followed amniota, then mammals around 200 million years ago, and aves about 100 million years ago. However, despite the evolution of large animals, organisms similar to the beginning of the process of evolution of organisms still dominate the earth, with the majority of earth's biomass and species of prokaryotes.
Tuesday, February 16, 2010
EVOLUTION OF LIFE
Although there is uncertainty of how life originated, is generally accepted that prokaryotic life on earth about 3-4 billion years ago. There is not a lot of changes in cell morphology or organization that occurs in these organisms over several billion years into the futureEukaryotes is a major development in the evolution of cells. He came from ancient bacteria ingested by prokaryotic ancestors in cooperative association called endosimbiosis. Oral bacteria and host cells and then undergo evolution, the bacteria evolved into mitochondria or hidrogenosom. Ingestion separately in both organisms similar to cyanobacteria resulted in the formation of chloroplasts in algae and plants. It is not known when the first eukaryotic cells appeared, even though these cells appeared around 1.6 to 2.7 billion years ago.History still lives in the form of eukaryotes, prokaryotes, and single-celled arkaea until about 610 billion years ago, when multicellular organisms began to appear in the ocean Ediakara period. Multicellular evolution occurs in many separate events, occurring in diverse organisms such as sponges, brown algae, cyanobacteria, slime mold, and miksobakteri.Soon after the emergence of multicellular organisms, a large amount of biological diversity appeared over a period of more than about 10 million years in events known as Kambria explosion. At this time, the majority of modern animals appeared in the fossil record, as well as the lineage of extinct animals. Several drivers have been proposed Kambria explosion, including the accumulation of oxygen in the atmosphere from photosynthesis. Around 500 million years ago, plants and fungi colonize the land, and soon followed by arthropods and other animals. First amphibians appeared about 300 million years ago, followed amniota, then mammals around 200 million years ago, and aves about 100 million years ago. However, despite the evolution of large animals, organisms similar to the beginning of the process of evolution of organisms still dominate the earth, with the majority of earth's biomass and species of prokaryotes.
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