Dependence of the South on the North
If it is "the possibility of black holes", then the answer is "direct object". "Many scientists" is the subject, there is no "predicate noun" because there is no linking verb here, there are no adverbs in this sentence, nor adjectives, and the object of a preposition would be "black holes", because it follows a preposition OF.
<span>The fcc chairman most closely associated with the deregulation of broadcasting is Mark Fowler, an appointee of the reagan administration.</span>
December 12, 1787 It was founded