Eighteen-month-old William’s vocabulary consists mainly of words such as "milk," "bottle," "truck," and "book," and very few social formulas or pronouns like "all done" or "give me." William uses a(n) style of speech.

Referential                                                                    

Explanation:

Referential style: The term "referential style" is described as a style of speech in which early learning of language occurs in toddlers where they use language mostly to label different objects. However, referential style develops as soon as toddlers stats to use language as a source to interact with some other person and emphasizes social pronouns and formulas.

In the question above, William uses a referential style of speech.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

answer; the cats meowing will temporarily increase, but then it will decrease;