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(A) Respiration in $Cnidarians$ (such as $Hydra$ and $Jellyfish$) occurs through the process of simple diffusion.Since these organisms have a simple b

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Cnidarians

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(A) Respiration in $Cnidarians$ (such as $Hydra$ and $Jellyfish$) occurs through the process of simple diffusion.Since these organisms have a simple body organization and are in direct contact with the surrounding water,dissolved oxygen enters their body cells,and carbon dioxide leaves the body through the general body surface via diffusion.Fishes use gills,while amphibians and reptiles primarily use lungs or skin (in some cases) but do not rely solely on simple diffusion across the entire body surface like $Cnidarians$.

Column-$I$ (Plant Part)	Column-$II$ (Gas Exchange Structure)
$P$. Leaves and young stems	$I$. Lenticels
$Q$. Woody stems	$II$. Stomata
$R$. Roots	$III$. Root hairs

Which of the following organisms obtain dissolved oxygen from water by diffusion through their body surface during respiration?

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Explain the structures of respiratory organs for the exchange of gases in various groups/kingdoms of animals.

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Column-$I$ (Plant Part) Column-$II$ (Gas Exchange Structure)

$P$. Leaves and young stems $I$. Lenticels

$Q$. Woody stems $II$. Stomata

$R$. Roots $III$. Root hairs

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