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Chapter 17:
Chapter 17:

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... produce oxygen during photosynthesis. The amount of Carbon Dioxide would also increase because there would not be any plants using the CO2 in the atmosphere (as they do for photosynthesis). 7. Why is solar energy needed for photosynthesis? It is the main reactant for photosynthesis. Sunlight is a fo ...
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Symbiogenesis



Symbiogenesis, or endosymbiotic theory, is an evolutionary theory that explains the origin of eukaryotic cells from prokaryotes. It states that several key organelles of eukaryotes originated as a symbiosis between separate single-celled organisms. According to this theory, mitochondria, plastids (for example chloroplasts), and possibly other organelles representing formerly free-living bacteria were taken inside another cell as an endosymbiont around 1.5 billion years ago. Molecular and biochemical evidence suggest that mitochondria developed from proteobacteria (in particular, Rickettsiales, the SAR11 clade, or close relatives) and chloroplasts from cyanobacteria (in particular, nitrogen-fixing filamentous cyanobacteria).
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