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Changes In The Atmosphere Causing Multicellularity
Beginning of essay
About 2.5 billion years ago, oxygen began slowly to accumulate in the
atmosphere, as a result of the photosynthetic activity of the cyanobacteria.
Those prokaryotes that were able to use oxygen in ATP production gained a strong
advantage, and so they began to prosper and increase. Some of these c ....
Middle of essay
....cells
living inside larger prokaryotes. The endosymbiotic hypothesis accounts for the
presence in eukaryotic cells of complex organelles not found in the far simpler
prokaryotes. Many modern organisms contain intracellular symbiotic bacteria,
cyanobacteria, or photosynthetic protists, indicating that such associations are
not difficult to establish and maintain. Endosymbiosis is said to be
responsible for the presence of chloroplasts and mitochondria in eukaryotes.
Autogenisis, the alternativ.... |
| Number of words: 471 |
Approximate pages: 2 |
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