I'm offering Brainliest to the best answer. Please answer both! Thank you! Also if you were wondering this is not a test its a review so don't worry I'm not cheating. :)

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

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well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."