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(B) In deep ponds and lakes,the oxygen concentration at the bottom is very low primarily due to the limited penetration of sunlight. Sunlight is essen

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Lesser amount of sunlight

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(B) In deep ponds and lakes,the oxygen concentration at the bottom is very low primarily due to the limited penetration of sunlight. Sunlight is essential for photosynthesis by phytoplankton and aquatic plants,which produce oxygen. As sunlight cannot reach the deeper layers,photosynthesis is significantly reduced or absent,leading to lower oxygen levels at the floor of the water body.

The oxygen concentration at the floor of the deep ponds and lakes is very low because of the

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