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

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.