Awhite dwarf, a dense dead star, burns through its hydrogen before it can grow into a supernova. identify the nonessential appositive phrase. a white dwarf a dense dead star hydrogen supernova

To provide more information or to identify a word, a noun or pronoun is placed with another noun or pronoun, referred to as an appositive phrase.

An appositive phrase may be nonessential or essential.

In essential appositive, the words are not set off with commas.

Whereas, nonessential appositive refers to the addition of meaning in a sentence which is already clear and is set off with commas.

Hence, in the above sentence, the nonessential appositive phrase is 'a dense dead star'. Herein, 'dense dead' are modifiers which modify 'star' and provides detail about it.

d is the best answer for this question.

answer; (d) i believe the best answer is ; ///people said that man could not fly, but in 1903, orville and wilbur wright made the first sustained powered flight in a heavier- than-air machine;