Which of the following is the most universal signaling agent?
A) Ca2+
B) Na+
C) K+
D) Cl-
A
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The increasing rate of population growth over the past 50 years is the result of:
a. increasing birth rates in the developed countries b. increasing birth rates in the developing countries c. decreasing mortality rates in the less developed countries d. increasing mortality rates in the less developed countries
An example of a type of limestone that precipitates from fresh water (as contrasted with precipitation from sea water) is:
a) Chert b) Opal c) Travertine d) Tuff e) Jasper
The low-tide terrace ________.
A. is the high and dry part of the beach B. is found between high- and low-tide levels C. lies above the surf zone D. is the same as the backshore E. is part of the foreshore
If very warm and salty sea water is added on top of average seawater, ________.
A. the warm salty water will float at the surface B. an overturn will begin C. the warm salty water will sink to the bottom and stagnate D. the warm salty water will sink and move rapidly out of the area E. The answer cannot be determined unless the densities of the warm salty water and average sea water are known.