Answer:
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<em><u>When the tide goes out, the barnacle closes shop to conserve moisture. As the tide comes in, a muscle opens up these four plates, and the feathery legs of the barnacle sift the water for food.</u></em></h2>
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Answer: Up
Explanation: when an electron goes up it produces more energy which makes light. :)
The choice that best fits and answers the question is;
D: absorption
I hope this answer is sufficient and has aided you.
Cheers.