Final answer:
The universe of discourse for positive integers allows the use of quantifiers to make true statements.
Step-by-step explanation:
The question is asking about the universe of discourse, which is the set of positive integers, and whether it is true or false that each quantifier can be used in this set. In this case, the answer is True. When the universe of discourse is the set of positive integers, both existential and universal quantifiers can be used to make true statements. For example, the statement 'There exists an even number' would be true because there are positive even numbers in the set.