How are two headed mutation different from conjoined twins?

Two-headedness is really a severe example of conjoined twins. These twins happen when identical twins don't separate completely. Instead of two twins, you end up with twins who are still attached. The attachment can be as little joining as just a piece of skin or cartilage connecting the two twins.

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explanation:

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.