just the letters. no need for detailed explainations :))))

94. The transfer of nitrogen from the atmosphere to the soil, to living organisms, and back to the atmosphere a. Nitrogen Cycle b. Water cycle c. Nitrogen Fixation d. Oxygen Cycle 95. (T/F) During the summertime, lakes will be stratified so that the aerobic conditions are at the bottom and anaerobic conditions are at the top. This due to the warming of the surface water killing all of the aerobic organisms. a. TRUE b. FALSE 96. (T/F) The oxidation of ammonia and ammonium ions occurs in aerobic conditions by plants. a. TRUE b. FALSE 97. Find the incorrect statement. a. BOD value of clean water is less than 5 ppm b. Drinking water pH should be between 5.5-9,5 c. carbon, sulphur and nitrogen oxides are the most widespread air pollutants d. dissolved oxygen concentration below 5 ppm is ideal for the growth of fish 98. 8. Which of the oxide of nitrogen is not a common pollutant? a. No, b.NO c.NO d. NO, 99. Photochemical smog normally does not contain a. Chlorofluorocarbons b. Peroxyacetyl nitrate c. Ozone d. Acrolein