Which of the following represents a duplication in the DNA sequence A-G-T-C-T?

T-C-A-G-A

Explanation:

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In a DNA sequence, T-C-A-G-A (Thymine-Cytosine-Adenine-Guanine-Adenine) represents a duplication of A-G-T-C-T.

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the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.