A Gas Cylinder Contains Only the Gases Radon,nitrogen,and Helium

question 48

Multiple Choice

A gas cylinder contains only the gases radon,nitrogen,and helium.The radon has a pressure of 222 torr while the nitrogen has a pressure of 446 torr.If the total pressure inside the cylinder is 771 torr,what is the pressure that is due to the helium?

• A)771 torr
• B)668 torr
• C)549 torr
• D)103 torr
• E)none of the above

Understand the evolutionary advantages of various respiratory systems in vertebrates.

Distinguish between the characteristics of birds and mammals.

Identify unique features associated with the mammalian class.

Understand the evolutionary significance of nonvertebrate chordates, tunicates, and lancelets.

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