Bio-P2-fed-ch27 (Man and His Environment)
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Acid rain is produced by:
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In Ecuador, forest coverage has been reduced by _________________.
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Which of the following is a degenerative disease?
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Which of the following continents has the highest rate of human population?
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Tidal volume is the air:
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The total available Fresh Water in the form of lakes, streams and rivers on the earth is:
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The ozone layer extends about _____ above the earth.
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