Final answer:
A typical river mouth has decreased vegetation and lower oxygen levels.
Step-by-step explanation:
A typical river mouth is characterized by decreased vegetation and lower oxygen levels. As the river reaches its mouth, the flow slows down, resulting in sediment deposition. This sedimentation leads to decreased light penetration and limited plant growth. Additionally, the slow-moving water allows organic matter to accumulate, leading to lower oxygen levels in the water.
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