Which of the following accurately describes an effect of smoking? a. smoking damages cilia in the trachea and more particles enter the lungs. b. smoking lowers blood pressure. c. smoking enables hemoglobin to carry more oxygen. d. smoking decreases heart rate.

What discovery would weaken the primordial soup hypothesis of the origin of life? question 19 options: lightning was common on early earth. earth’s early atmosphere contained carbon dioxide, water, and trace gases. earth’s early oceans were warm and shallow. asteroid impacts were uncommon when life is presumed to have begun.