Scientists predict that global warming could cause

Scientists predict that global warming could cause changes in rainfall intensity.

Explanation:

For decades, scientists have debated whether global warming would cause widespread growth in the amount of rainfall on the planet - the assumption is somewhat logical, given that the amount of water vapor accumulated in the atmosphere will be greater. The increase in temperature will also cause evaporation in the oceans, which will cause changes in the intensity of rain and may cause more intense storms than normal.

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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.