Which is a colorless, odorless, poisonous gas produced when tobacco burns?

a.
nicotine

b.
carbon dioxide

c.
carbon monoxide

d.
tar

Explain why you would or would not have a lasik surgery if you wore contacts or glasses.describe how public opinions related to this surgery have changed over the years.in your own words, explain this surgery as though you are explaining it to someone who has no knowledge of the procedure

How is the structure of our circulatory system and respiratory system related to the function of both these systems?

The maximum blood pressure in the upper arm of a healthy person is about 120 mmhg. if a vertical tube open to the atmosphere is connected to the vein in the arm of the person, determine how high the blood will rise in the tube. take the density of the blood to be 1040 kg/m3.