Regions of the deep ocean characterized by smooth ocean floor are called

The abyssal plains

Explanation:

The abyssal plains are the regions in the seafloor that are comparatively flat and extends upto hundreds of kilometer wide and a few thousands of kilometer in length. They are usually at a depth ranging from 3500 to 6000 m below the sea level.

The topography of these plains are relatively very smooth. The rate of accumulation of the sediments is very slow and they were assumed to be a stable environment that has undergone least changes. The slope of these abyssal plain is smaller than the continental shelf.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.