What interferes with river flow?

There are several manmade and natural barriers that interferes with the river flow

Explanation:

The following structures man made structures interferes with the flow of a river -

a) Gyrones

b) Canyon

c) Dams

d) diverging canals

e) Bridge abutments/pillars

f) embankments

g) spill ways

h) drainage systems

etc

Along with manmade structure several natural obstruction also interferes with the river flow -

a) Undirected mearning

b) Catchment area slope

c) slope of the river itself

d) natural barriers like valleys, hills and mountains

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

the answer is cell division : )