Bacteria break down organic matter and return carbon dioxide and water to the environment. This is an example. A. combustion. B. Transpiration c. Nitrogen fixation. d. decomposition.​

The answer is C-Nitrogen

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.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times