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
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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.
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
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.
Describe the three main vertical layers of the ocean
What will be an ideal response?