What is the mechanism of breathing for sponges?

What is the mechanism of breathing for sponges?
  1. By simple diffusion over their entire body surface
  2. Through tracheal tubes
  3. By a moist cuticle
  4. By pumping water through a series of chambers

Solution

Sponges exchange O₂ and CO₂ by simple diffusion over their entire body surface.

Asked in: NCERT

Practice more Breathing and Exchange of Gases questions on Aicharya