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how does the cardiovascular system help the body maintain a steady temperature in cold weather?
Weegy: In cold weather, skin hairs in both humans and animals stand up (called piloerection), which causes entrapment of the air in the hair web. [ The trapped air forms an insulating layer due to the blood exchanging heat with the warmer microclimate created by the hair web, rather than the colder environment of the air outside of the web. Humidity (water vapor content of air) plays a significant role in heat loss, especially by evaporation. In high humidity climates, the air already contains many water molecules, which decreases the air’s capacity to accept more water. This is due to the concentration gradient, which is decreased in cases of high humidity. The high humidity limits sweat evaporation, and hence, heat loss. On the other hand, low humidity promotes heat loss through evaporation, especially during exercise. Nonetheless, low humidity environments are not without their problems to the athlete. If water from the skin evaporates faster than sweat production, severe dryness of the skin may occur. ] (More)
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Asked 7/5/2012 11:11:44 AM
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whqt was one of the article of confedration achievements
Weegy: The most important positive aspect of the Articles of Confederation is that they kept the new United States together through the Revolutionary War and the early years of the country. [ This is no small achievement, even if the Articles were severely flawed. ] User: what was the name of the essay that james madison wrote (More)
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Asked 7/5/2012 12:07:05 PM
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Which process involves endonucleases, gel electrophoresis, ligation, and transformation? A. carbon reduction B. DNA microarray C. protein synthesis D. DNA recombination
Weegy: The various techniques by which scientists manipulate DNA in the lab are called A. genetic engineering B. biotechnology C. recombinant DNA D. gel electrophoresis E. gene probes (More)
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Asked 7/5/2012 12:20:34 PM
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what was a primary source great britain wanted to work with t he united states to enforce the monroe doctroine
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Updated 6/3/2014 1:35:22 PM
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Great Britain wanted to work with the United States to enforce the Monroe Doctrine mainly in order to free the newly independent colonies of Latin America from European intervention and avoid situations which could make the New World a battleground for the Old World powers.
Added 6/3/2014 1:35:22 PM
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what is the louisana purchase
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Updated 12/14/2014 5:33:25 AM
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The Louisiana Purchase was the acquisition by the United States of America in 1803 of 828,000 square miles of France's claim to the territory of Louisiana.


Added 12/14/2014 5:33:25 AM
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