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The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth. Dates in this article are consensus estimates based on scientific evidence, mainly fossils. In biology, evolution is any change across successive generations in the heritable ...
Cyanobacteria become the first oxygen producers 2.4 – 2.3 billion years ago Earliest evidence (from rocks) that oxygen was in the atmosphere 1.2 billion years ago Red and brown algae become structurally more complex than bacteria 0.75 billion years ago Green algae outperform red and brown algae in the strong light of shallow water
Cyanobacteria are ubiquitous in marine environments and play important roles as primary producers. They are part of the marine phytoplankton, which currently contributes almost half of the Earth's total primary production. [ 33 ] About 25% of the global marine primary production is contributed by cyanobacteria.
Cyanobacteria can fluctuate in their toxin production, with levels that can change rapidly. These toxins can pose significant health risks to both humans and animals, particularly dogs, which are ...
The evolution of bacteria has progressed over billions of years since the Precambrian time with their first major divergence from the archaeal / eukaryotic lineage roughly 3.2-3.5 billion years ago. [ 1 ][ 2 ] This was discovered through gene sequencing of bacterial nucleoids to reconstruct their phylogeny.
Edwin Moses always loved the sport of track and field.But reaching the Olympics always seemed like a tall order.. At a young age, Moses was a lot smaller than the other runners. In high school, he ...
A similar event occurred with photosynthetic cyanobacteria [124] entering large heterotrophic cells and becoming chloroplasts. [112]: 60–61 [125]: 536–539 Probably as a result of these changes, a line of cells capable of photosynthesis split off from the other eukaryotes more than 1 billion years ago. There were probably several such ...
The Great Oxidation Event (GOE) or Great Oxygenation Event, also called the Oxygen Catastrophe, Oxygen Revolution, Oxygen Crisis or Oxygen Holocaust, [2] was a time interval during the Earth 's Paleoproterozoic era when the Earth's atmosphere and shallow seas first experienced a rise in the concentration of free oxygen. [3]