base is 1 to rising in mutualism slope which interaction it acidic
acid_base_equilibrium is not chemical_equilibrium. acid_base_indicator is indicator. acidity is ph. acid_base_equilibrium is chemical_equilibrium. phenolphthalein is acid_base_indicator. constancy is changelessness. constancy is not changelessness. litmus is acid_base_indicator. litmus is not acid_base_indicator. acidity is sour.