Find the nonspecific terms in the following sentences. Replace the non-specific choices with more precise terms or phrases. Note that it is not necessary to change the sentence structure; just replace the individual words. Guess or invent something if you have to. 1. Plants were kept in the cold overnight. 2. Some exoplanets orbit multiple stars. 3. The population of bivalve molluscs per square meter decreased markedly between 1999 and 2001.