Premise: Extreme environment . These conditions may be extremely high or low temperature or pressure ; high or low content of oxygen or carbon dioxide in the atmosphere ; high levels of radiation , acidity , or alkalinity ; absence of water ; water containing a high concentration of salt or sugar ; presence of sulphur , petroleum , and other toxic substances .
Hypothesis: Extreme environments can be caused by a variety of factors that push equilibrium off.
Label: ENTAILMENT