Which term can refer to changes in DNA bases as well as changes in chromosome number and/or structure?

Mutation

Explanation:

Mutation refers to the change in the genetic composition of a cell. Mutation ranges in size from a single DNA base to a large segment of a chromosome.

Mutations could be small scale like point mutation affecting bases OR large mutations like chromosomal translocation, chromosomal inversions affecting chromosomes

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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.