Sponges exchange O2 with CO2 by ______.

(A)simple diffusion over their entire body surfaces
(B)moist cuticle
(C)tracheal tubes
(D)gills

The NCERT line that answers it

Verbatim line

Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange $O_2$ with $CO_2$ by simple diffusion over their entire body surface.

Chapter: Breathing and Exchange of Gases
Section: 14.1 RESPIRATORY ORGANS

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that sponges exchange O2 with CO2 by simple diffusion over their entire body surface, which directly matches the correct answer and distinguishes it from other options.

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