What happens to air as it is warmed?
a. It rises.
b. It sinks.
c. It moves toward higher latitudes.
d. It moves along a pressure gradient.
e. It moves toward lower latitudes.
ANSWER: a
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A. Guanine pairs with cytosine. B. Adenine pairs with uracil. C. The backbone is made up of alternating 5-carbon sugars and phosphate groups. D. It is comprised of nucleotides.
Which of the following pairs is incorrectly matched for cells and the molecules they secrete?
A. Mast cells; histamine B. Natural killer cells; toxic chemicals C. Eosinophils; toxic chemicals D. Neutrophils; heparin E. Basophils; heparin
After much study, ecologists have come to the conclusion that competitive exclusion
A. occurs rather frequently in nature. B. occurs more frequently in tropical habitats than temperate ones. C. occurs very rarely in nature. D. occurs more frequently on islands than on the mainland.
The numerical value of the free energy change indicates how fast a reaction will reach equilibrium.
Answer the following statement true (T) or false (F)