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What is the mechanism of breathing in lower invertebrates like sponges, coelenterates, flatworms, etc.?
Option: 1
Tracheal tubes
Option: 2
Cutaneous respiration
Option: 3
Branchial respiration
Option: 4
Simple diffusion over their entire body surface
Answers (1)
Lower invertebrates like sponges, coelenterates, flatworms, etc. exchange O2 with CO2 by simple diffusion over their entire body surface.
Option 4 is the correct answer.
View full answer
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