worldgen:planets:lifelevel
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| The marker for [[./LifeLevel/Archaean]] worlds is the rise of [[:worldgen:commodity:prokaryotes]], which are the first living organisms. They are very basic cellular life. Once they arise, they quickly come to dominate the ecosystem. They may be found in trace amounts on //Organic// worlds, but an //Archaean// world will be dominated by //Prokaryotes// or more complicated forms of life. | The marker for [[./LifeLevel/Archaean]] worlds is the rise of [[:worldgen:commodity:prokaryotes]], which are the first living organisms. They are very basic cellular life. Once they arise, they quickly come to dominate the ecosystem. They may be found in trace amounts on //Organic// worlds, but an //Archaean// world will be dominated by //Prokaryotes// or more complicated forms of life. | ||
| - | Within a few tens of millions of years, these give rise to some form of [[:worldgen:commodity:cyanobacteria]], which make use of photosynthesis for energy. Because they are so much more efficient, they quickly come to dominate the biosphere, and are probably dominant on most //Archaean// worlds. | + | Within a few tens of millions of years, these give rise to some form of [[:worldgen:commodity:cyanobacteria]], which make use of photosynthesis for energy and produce oxygen. Because they are so much more efficient, they quickly come to dominate the biosphere, and are probably dominant during the late stages of //Archaean// worlds. |
| + | However, their production of oxygen changes the biosphere, and turns //Archaean// worlds into [[./LifeLevel/Aerobic]] worlds. | ||
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| + | [[:pcl:EoGaian]] worlds are pre-Aerobic, with a mostly methane atmosphere. Once the life classification changes from //Archaean// to //Aerobic//, then terrestrial worlds is classes as [[:pcl:MesoGaian]]. | ||
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| + | ==== Metazoa ==== | ||
| With the rise of oxygen, so the [[./LifeLevel/Aerobic]] stage is reached. [[:worldgen:commodity:plankton]] consumes smaller life forms, forcing the evolution of larger and more complex organisms. Larger varieties of algae becomes [[:worldgen:commodity:seaweed]] and [[:worldgen:commodity:jellyfish]] evolve. Eventually, the arrival of [[:world:commodity:simple marine]] organisms, such as starfish, sea urchins and worms marks the last stages of the Aerobic classification. | With the rise of oxygen, so the [[./LifeLevel/Aerobic]] stage is reached. [[:worldgen:commodity:plankton]] consumes smaller life forms, forcing the evolution of larger and more complex organisms. Larger varieties of algae becomes [[:worldgen:commodity:seaweed]] and [[:worldgen:commodity:jellyfish]] evolve. Eventually, the arrival of [[:world:commodity:simple marine]] organisms, such as starfish, sea urchins and worms marks the last stages of the Aerobic classification. | ||
worldgen/planets/lifelevel.1515927405.txt.gz · Last modified: 2018/01/14 10:56 by sam
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