Several species of blind shrimp dig tunnels in sandy sediment, which they share with particular species of goby fish that cannot burrow. The fish look out for predators, and warn the shrimp to retreat into the shared burrow by flicking their tails against the shrimp's antennae.

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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