As a result of preferences given to skilled workers by many countries, source countries are most likely to. A) implement their own immigration quota system.
(On google)
False, it is also prominent for Christians and I believe Muslims
Green house effect & Warming that results when the atmosphere traps radiating from earth towards space <span />
The atmosphere is like a blanket for our planet, within this atmosphere, there's a layer called "The ozone layer" which protects our planet from most of the sun's harmful rays. And yes, the ozone layer has holes, because of the pollution.
The answer to this question is:
A. Barley and wheat were both civilizations' main crops
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