One of the reasons that amphibians are primarily limited to freshwater aquatic habitats is that their kidneys lack __________ to concentrate urine and conserve water.

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The loop of the nephron is responsible for concentrating urine and conserving water. Since amphibians lack this structure in their kidneys, they are primarily limited to freshwater aquatic habitats where they can constantly intake water to compensate for the lack of water retention in their body.

One of the Reasons That Amphibians Are Primarily Limited to Freshwater