The chemical name for sand is silicon dioxide. the two elements found in a sample of this sand are and

Silicon and oxygen

Explanation:

The chemical formula for silicon dioxide is SiO2. Hence, silicon dioxide has one atom of silicon (Si) and two atoms of oxygen (O). Analysis of sand rich in silicon dioxide would have two elements namely, "silicon (Si) and oxygen (O)".

the answer to your question is:

c. complementary base-pairing

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