(February 2013) Durham tubes are used in microbiology to detect production of gas by microorganisms. They are simply smaller test tubes inserted upside down in another test tube. This small tube is initially filled with the solution in which the microorganism is to be grown.
A compound predicate is two or more simple predicates joined by a conjunction that indicate actions by the same subject. Example : Bill picked up the mail and walked the dog.. Bill is the subject for both verbs.
A compound sentence is one of four main sentence structures, all of which are shown below. In these examples, the independent clauses are shaded. A Complex Sentence. A complex sentence has an independent clause and at least one dependent clause. Diplomacy is the art of saying nice doggie until you can find a rock.