A subsistence economy is one that ________
A) meets its environmental need by over fishing lakes and rivers
B) meets is environmental needs while causing ecosystem destruction
C) purchases goods and services from others
D) purchases resources for immediate use
E) meets its environmental needs without accumulating wealth
Answer: E
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In reverse the osmosis of sea water to produce drinking water approximately what is the typical residual concentration of salt in the drinking water which is produced?
A) 0 B) 40 ppm C) 400 ppm D) 4000 ppm
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