Salvador, Brazil is located at 13° S (and at an elevation of 9 m). Based on its latitudinal position, which of the following likely best describes its temperature?
A) Seasonal variations of temperature are most pronounced in the summer.
B) Summers are exceptionally hot, but winters are typically quite mild.
C) Cool and mild temperatures predominate throughout the year.
D) Temperatures can range from -10°C (14°F) in the winter to 21°C (70°F) in the summer.
E) The temperature is consistently high throughout the year.
E
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The air that a scuba diver breathes is pressurized to counteract the pressure exerted by the surrounding water. Under these conditions, excessive amounts of nitrogen dissolves in bodily fluids, such as blood. If the diver ascends to the surface too rapidly, the excessive nitrogen bubbles out of the bodily fluids-much like carbon dioxide bubbles out of a soda immediately after it has been opened. This results in a painful and potentially lethal medical condition known as the bends. Why does breathing a mixture of helium and oxygen rather than air help divers to avoid getting the bends?
A. The helium is less soluble in the bodily fluids and so less dissolves for a given pressure. Upon decompression, there is less helium to "bubble out" and cause potential harm. B. Helium is a smaller molecule than nitrogen, so when it bubbles out of solution, it is less painful and less harmful to the body. C. The nitrogen in the blood will bind to helium and so will be exhaled rather than being stuck in the blood. D. Oxygen and helium have stronger attractions for each other than they do for the blood, so less helium will be dissolved in the blood and to cause the bends.
The _______________ took control over Haiti.
Fill in the blank(s) with the appropriate word(s).
Even using the best methods for sustainable agriculture, Green Revolution grain crops in developed nations are ultimately limited by which factor that is beyond the grower's control?
A) Weather B) Pests C) Soil degradation D) Problems with transportation and storage
The fact that older fossils are more unlike living organisms implies that old forms of life died out and that new forms of life have developed is known as ________.
A. law of superposition B. law of faunal succession C. law of original horizontality D. law of inclusions