O_{2} exchange with CO_{2} by simple diffusio | vedclass

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(D) The mechanism of breathing varies among different groups of animals,depending mainly on their habitats and level of organization.Lower invertebrat

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(D) The mechanism of breathing varies among different groups of animals,depending mainly on their habitats and level of organization.Lower invertebrates such as sponges $(I)$,coelenterates $(II)$,and flatworms $(III)$ exchange $O_{2}$ with $CO_{2}$ by simple diffusion over their entire body surface.Therefore,all the listed organisms perform gas exchange through this method.

$O_{2}$ exchange with $CO_{2}$ by simple diffusion over the entire body surface takes place in:
$I.$ Sponges
$II.$ Coelenterates
$III.$ Flatworms
Select the correct option to complete the given statement.

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$O_{2}$ exchange with $CO_{2}$ by simple diffusion over the entire body surface takes place in:$I.$ Sponges$II.$ Coelenterates$III.$ FlatwormsSelect the correct option to complete the given statement.