Asandbar is formed by water moving sediment downstream, and numerous sandbars and abundant woody debris provide valuable habitat for aquatic species. Given these facts, water moving sediment downstream can form among the following options:
- fissures of hot, acidic water
 - taiga
 - underground systems
 - habitats for aquatic species
 - swamp vegetation
 - hurricanes
 - volcanoes
 - basic building blocks of life


 

    habitats for aquatic species     