Organisms with a false coelom, like roundworms, are called

Pseudo-coelom.

Explanation:

Coelom may be defined as the body cavity of the organisms. Three main types of coelom are acolomates, pseudocoelomates and true coelomates. Acoelomates does ot conatin any coelom.

Pseudo-coelom are the false cavity present in the organism. Their ody cavity is not derived by the mesoderm but form the blastocoel. They are also known as blastocoelomate. Example includes the roundworms.

Thus, the answer is pseudo-coelom.

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.