Ecology is the study of environmental interactions at the following levels, from least inclusive to most inclusive:

organism, population, community, ecosystem

Explanation: Ecology is the part of the biology in which the study of organism and environment is done along with the relation established between them. This study also includes human,animals and physical surroundings as well. It displays the adaptation and interaction happening in the ecological environment.

The stage/steps of order is followed as organism then population of human, community of them and ecosystem stage respectively .

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.

i dont know this but ask your teacher for !