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worldgen:planets:lifelevel [2015/02/04 22:39]
127.0.0.1 external edit
worldgen:planets:lifelevel [2018/01/14 11:44] (current)
sam
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 The //life level// of a world defines (in very broad terms) how advanced native life is on the world. It ranges from no life at all, through simple single celled organisms, to land animals and extensive (Earth-life) conditions. The //life level// of a world defines (in very broad terms) how advanced native life is on the world. It ranges from no life at all, through simple single celled organisms, to land animals and extensive (Earth-life) conditions.
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-The life level of a planet is defined in the enum [[http://​mapcraft.svn.sourceforge.net/​viewvc/​mapcraft/​trunk/​traveller/​src/​uk/​org/​glendale/​rpg/​traveller/​systems/​codes/​LifeType.java?​view=markup|LifeType]] 
  
 See: See:
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   * [[./​LifeLevel/​Extensive]]   * [[./​LifeLevel/​Extensive]]
  
-Note that these classifications have just undergone a big change. The first three used to be //Proteins//, //Protozoa// and //Metazoa//. This didn't fit evolution very well however unless either Metazoa covered a very large rangeor the names didn't fit the type of life they covered.+//Organic// and //Archaean// are quite common on worlds that could potentially support lifebut life becomes significantly rarer as you move up through ​the classifications.
  
 ===== Evolution ==== ===== Evolution ====
  
-The evolutionary path on Earth can be considered to have been something ​like the following.+The evolutionary path on worlds ​can be very different in the details, but the initial steps are broadly similar at the high level. Diversity really comes in beyond the //Aerobic// stage. 
 + 
 +==== Early Life ==== 
 + 
 +[[:​worldgen:​commodity:​organicchemicals]] originally formed, which were simple amino acids. Most worlds with liquid water will form basic organic molecules ​like this, but few progress any further. Such worlds have an [[./​LifeLevel/​Organic]] classification. 
 + 
 +[[:​worldgen:​commodity:​protobionts]] are a form of non-living matter that is the precursor to living matter, and are a more complex form of //Organic Chemicals//​. 
 + 
 +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 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.
  
-[[:worldgen:commodity:​base organics]] originally formed, which were simple amino acids. Most worlds with liquid water will form basic organic molecules like thisbut few progress any further.+[[: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]].
  
-When abiogenesis gives rise to [[:​worldgen:​commodity:​simple organics]], a world is rated as being [[./​LifeLevel/​Archaean]]. These are the first living things, mostly single celled organisms capable of asexual reproduction. Within a few hundred million years, multicelled [[:​worldgen:​commodity:​metazoa]] such as bacteria will evolve. At this point, life can stall until suitable levels of oxygen can build up in the oceans. Life more complex than bacteria will be present in small amounts towards the end, including [[:​worldgen:​commodity:​sponges]] and [[:​worldgen:​commodity:​algae]].+==== 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.1423089557.txt.gz · Last modified: 2015/02/04 22:39 by 127.0.0.1