Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%. By what percent would the arterial pressure difference produced by the heart have to be increased to maintain a constant blood flow?
A) 48%
B) 52%
C) 50%
D) 46%
E) 54%
B
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What is the direction of 
at point O?
A. A B. B C. C D. D E. E F. F T. Zero
Place an iron rod inside a current-carrying coil of wire and you
A) increase the strength of the electromagnet. B) have a superconducting magnet. C) a magplane in the making.
Why do scientists suspect that life first arose near deep-sea volcanic vents or similar environments with abundant chemical energy?
A) A deep ocean environment would have protected early organisms from ultraviolet radiation before the formation of the ozone layer. B) All organisms have similar DNA, with further relations having greater differences. C) The chemical pathways for extracting energy from chemicals in vents are simpler than photosynthesis. D) A and B E) A and C F) A, B, and C
Gas, ______________, and pyroclastics are the three general products emitted during a volcanic eruption
Fill in the blank(s) with correct word