The average C02 level in the earth's atmosphere is ________ ppm yet the common level injected into greenhouses is ________________ ppm
Fill in the blank(s) with correct word
about 400 ppm, 900-1200 ppm.
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The World Health Organization specifies that total dissolved solids (TDS) not exceed ____ milligrams per liter
A) 1,500 B) 1,000 C) ?3,000 D) 2,000
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Females come into heat within 24 hours after giving birth
Indicate whether the statement is true or false
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There is a scientific consensus that changes in the composition of the atmosphere are the result of human activities
Indicate whether the statement is true or false
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Most port-helix injection pumps on North American diesel engines are timed to which engine cylinder?
A. Always to cylinder 1. B. Either cylinder 1 or 6 C. Always the highest numbered cylinder. D. The cylinder closest to the pump.
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