The interpretation of a halo around the Moon as a sign of impending rain (or snow) stems from:
A) the geometry of the Moon's size and distance.
B) halos being present only when clouds are thick.
C) a false weather proverb.
D) the association of cirrus clouds with cyclonic storms.
D
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Gap junctions
A) are slender threads of cytoplasm that link adjacent plant cells. B) require a lock-and-key fit between a receptor and a message molecule. C) are found in both animal cells and plant cells. D) are tiny channels between adjacent animal cells.
In general, fertility rates
A) decrease as per capita income increases. B) decrease as per capita income decreases. C) increase as per capita income increases. D) are unrelated to per capita income.
A greenhouse is an example of a(n)
A) active solar energy system. B) biomass generator. C) nonrenewable energy source. D) passive solar energy system. E) fusion system.
Population growth is determined by ________
A) birth, death, and doubling time B) birth, death, and environmental resistance C) birth, death, immigration and emigration D) birth, death, and total fertility E) birth, death, and emigration