The dissolved oxygen of the groundwater escapes into air. – McqOptions

MCQOPTIONS

1.	The dissolved oxygen of the groundwater escapes into air.
A.	nitrogen, phosphorous and potassium
B.	carbon, iron, and boron
C.	magnesium, manganese and sulphur
D.	magnesium, zinc and iron
Answer» B. carbon, iron, and boron

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