This Venn diagram is being used to compare primary and secondary successions. Which statement belongs in the region marked X? occurs only in cases of volcanic activity changes occur gradually begins when lichens populate an area results in a reduction of the number of species

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).