Answer:

8. Which of the following kills drinking contaminants?

A. boiling water for at least 3 minutes

B. filtration of water using sand and gravel

C. leaving the water under the sun for three minutes

D. none of the above

Explanation:

Water is of fundamental importance for life on earth. The synthesis and structure of cell constituents and transport of nutrients into the cells as well as body metabolism depend on water. The contaminations present in water disturb the spontaneity of the mechanism and result in long/short-term diseases. The probable contaminations and their possible routes are discussed in the present review.

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