Prostaglandins ________ the sensitivity of pain neurons, which become ________ with continued stimulation

A) increase; less sensitive
B) increase; more sensitive
C) decrease; less sensitive
D) decrease; more sensitive


B

Environmental & Atmospheric Sciences

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Water pollution in less-developed countries

A. is mainly caused by untreated sewage. B. occurs less frequently than in more-developed countries. C. does not include industrial wastes. D. does not include agricultural runoff. E. should improve soon.

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Any rock altered in the solid state from pre-existing rocks by any combination of heat, pressure,

and chemically active fluids:a. metamorphic rock c. sedimentary rock b. igneous rock

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Describe the three main vertical layers of the ocean

What will be an ideal response?

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All of the following are common sources of ground water pollution except

A) leaky underground storage tanks. B) oil tanker spills. C) leaky septic systems. D) landfill leaching.

Environmental & Atmospheric Sciences