Select the correct option regarding the respi | vedclass

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(C) The correct option is $C$. $1$. Sponges,coelenterates,and flatworms exchange $O_2$ with $CO_2$ by simple diffusion over their entire body surface.

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Aquatic arthropods - Respire through gills

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(C) The correct option is $C$. $1$. Sponges,coelenterates,and flatworms exchange $O_2$ with $CO_2$ by simple diffusion over their entire body surface. They do not have a specialized respiratory system. $2$. Earthworms use their moist skin (cutaneous respiration) for gas exchange,not gills. $3$. Aquatic arthropods (like crustaceans) respire through gills. $4$. Terrestrial arthropods (like insects) respire through a network of tubes called the tracheal system,not lungs.

Select the correct option regarding the respiratory organs in different animals:

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