The principle stating that the oldest rocks occur on the bottom of an undisturbed rock sequence is known as

a. superposition. b. original parallelism. c. relative age dating. d. original juxtaposition.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.

answer; blank(1); cervical; blank(2); lumbosacral;