Which of the following gases has no effect in the blood until hyperbaric conditions occur (as in SCUBA diving when one stays down too long at great depths), when a condition called ""rapture of the deep"" occurs, producing a narcotic-like effect, as this gas interacts with other blood chemicals?

a. Nitrogen
b. Oxygen
c. Carbon monoxide
d. Carbon dioxide
e. Helium

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !

Select the correct answer. which statement applies only to the axial skeleton, not the appendicular skeleton? a. it contains a pivot joint. b. it has muscles attached that work in pairs. c. it contains red bone marrow. d. it possesses fossa for bone articulation. e. it protects the heart and lungs.