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Gills are thin tissue filaments that are highly folded and:

ABleached
BBreached
CBrightened
DBranched
Answer & Solution
Correct answer: D. Branched
1. More surface means more exchange. 2. Folding and dividing both add surface. 3. So they are branched. _Source: OpenStax Biology 2e, Chapter 39, The Respiratory System._
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