Scientists conducted a 3-year study to determine which technique-- stones or sticks--is most effective in restoring fish habitats in a stream damaged by extreme erosion.
(Scientists; conducted; a 3-year study to determine which technique-- stones or sticks--is most effective in restoring fish habitats in a stream) (a stream; damaged; by extreme erosion)
Scientists a stream
conducted damaged
a 3-year study to determine which technique-- stones or sticks--is most effective in restoring fish habitats in a stream
by extreme erosion