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...ial worlds of the Earth's system, which all contain much more silicon than carbon). ...a clouds are in Class I, by water clouds in Class II, by alkali metals and carbon monoxide in Class IV, and by iron and silicates in Class V. Class III plan

...] of Xi). The atom with atomic number fourteen, [[silicon]], is second to carbon in this regard, such that there has been much speculation about the possibi ..., or for any other such macroscopic feature, but for the creation of large carbon-based molecules called [[protein]]s, made up of units called [[amino acid]]

...m [[photosynthesis]], the use of [[energy]] from [[sun]]light to convert [[carbon dioxide]] into [[sugar]]s and other organic compounds. In vascular plants, ...plement to the [[respiration]] of animals, which consume oxygen and exhale carbon dioxide, and makes it possible (with care) to produce an atmospherically cl

...d to 100%, they are rounded and actually add to slightly less) composed of carbon dioxide and other trace constituents. A fair amount of water vapor is also