At an altitude of 50 km, the average atmospheric temperature is essentially 0˚C. What is the average number of air molecules per cubic centimeter of air at this altitude?

29.1-12=17.1the answer is this one

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Answerd. may include all of these are many definitions of bases: the  brønsted-lowry definition of acids and bases says that bases are proton acceptors.the arrhenius definition of acids and bases says that bases increase [oh⁻] in solution (thereby producing oh⁻ ions)the lewis definition of acids and bases says that bases donate electron pairs.therefore, the sensible answer is that a base may include all of the described characteristics.