If when a river floods, that river harms farm and grazing lands, then when a river floods, that river harms what?

Answer choices:
- most organisms
 - Basic units of the plant body.
 - streams and volcanoes
 - mountains and lakes
 - farm and grazing lands
 - oceans and ponds
 - swamp vegetation
 - Plant growth is reduced

 

     farm and grazing lands     