Approximately 75% of the Earth's surface is covered in water. Why is water considered such a precious resource?

Though the earth is 75% water, less than 1.2% is actually drinkable.

Explanation:

it's unlikely a majority of a large population would agree on issues

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the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: