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Modular life support refers to life sustaining clothing. This could be an autonomous space suit but it also may be a suit that links into and is supported by on board system. But when a ship is described as having Modular Life support it is assumed that consumables are brought with the crew when they board. The internal life support systems ones that are part of the ship design and means that a passenger or crew member can survive in the cabin without protective clothing or his/her own source of breathable atmosphere. Internal Life Support is further broken down into standard or atmospheric. Atmospheric life support provides air pressure, a stored breathable air mixture, temperature control and radiation shielding. A standard life support system, referred to as standard because it is the required system on all dynastic spacecraft, includes gravity, nutrients and water. Within this category you also have sustaining life support. This is system by which the ship's life support purges itself of impurities created by passengers and actively produces new consumbles. This includes waste recycling, and a CO2 to O2 cycle. Cryogenic life-support means that there is a stasis chair or cryopot on the ship that can suspend life functions using minimal power.