1762Every Day ScienceMedium
Disolved oxygen (DO) in water should be?
A0.4 to 0.5 ppm
B4 to 5 ppm
C4000 to 8000 ppm
D400 to 800 ppm
Correct answer
B. 4 to 5 ppm
Explanation
4 to 5 ppm is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.