In a lake,phytoplankton grow abundantly in

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(B) In a lake,the ecosystem is divided into zones such as the littoral zone,limnetic zone,and profundal zone.In the $Limnetic$ zone,which is the open

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Limnetic zone

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(B) In a lake,the ecosystem is divided into zones such as the littoral zone,limnetic zone,and profundal zone.In the $Limnetic$ zone,which is the open water area away from the shore,light penetration is sufficient for photosynthesis.The primary producers in this zone are mainly phytoplanktonic algae,such as diatoms,green algae,and blue-green algae.In contrast,the $Profundal$ zone is the deep,dark region where light is insufficient for photosynthesis,and organisms here depend on organic matter falling from the upper zones.

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