Study the circled features on the surface of the Sun.
The circled areas are called
. Th...
Answers: 2
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Cells tend to have a relatively small and uniform size. why aren’t cells larger?
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The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?
Answers: 1
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Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins
Answers: 2
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