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Which statement regarding lesser invertebrates, such as sponges, coelenterates, flatworms, etc., is accurate?
Option: 1
They exchange gas through their lungs.
Option: 2
To move atmospheric air inside the body, they have a system of tubes.
Option: 3
They just diffuse CO2 and O2 throughout the surface of their entire body.
Option: 4
They exchange gases using vascularized bags.
Answers (1)
The process through which lower invertebrates such as sponges, coelenterates, flatworms, etc. exchange O2 with CO2 across their whole body surface is called simple diffusion.
Option 3 is the correct answer.
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