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Sewage water can be purified for recycling with the action of -----
(a) aquatic plants
(b) penicillin
(c) microorganisms
(d) fishes
Ultraviolet rays of the sunlight results in formation of --------
(a) Carbon monoxide
(b) Sulphur Dioxide
(c) Ozone
(d) Fluorides
Which is the most recently created cabinet department
How many members are in the president's cabinet?
What are the four major problem of students?
What are the behavioral problems in the classroom?