alleryStart learning →A flatworm breathes through its outer membrane. Its flat shape helps by raising the:
ASurface mark
BSurface area
CSurface tension
DSurface polish
Answer & Solution
Correct answer: B. Surface area
1. Every cell must sit near the outside.
2. Flattening spreads the body thin.
3. That raises the surface area.
_Source: OpenStax Biology 2e, Chapter 39, The Respiratory System._
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