As an approach to marine sustainability, many marine scientists suggest setting aside ____% of the world's oceans as fully protected marine reserves.
A. 50-60
B. 20-40
C. 10-30
D. 5-10
E. 1-3
Answer: C
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Pollution concentration is
A) determined solely by the quantity of emissions. B) determined solely by the wind speed. C) the quantity of a pollutant found within a specific volume of air. D) always higher during the day than at night.
Which of the following solutions is the most concentrated?
A. one liter of water with 1 gram of sugar B. one liter of water with 2 grams of sugar C. one liter of water with 10 grams of sugar D. one liter of water with 5 grams of sugar E. They all have the same volume.
The image below shows a beam of radiation passing between two electrically charged plates. 
Which of the beams is due to alpha particles?
A. a B. b C. c D. all of the above E. none of the above
The society of ________ Island was destroyed by environmental degradation
Fill in the blank(s) with correct word