Final answer:
The deep-sea bottom is not flat and featureless; instead, it has a variety of bed forms and topographical features such as trenches, ripples, and sand ridges, and supports abundant marine life due to high nutrient levels.
Step-by-step explanation:
The statement that the deep-sea bottom is monotonously flat and featureless is false. The ocean bottom is seldom flat and often contains various topographical features such as bed forms, including trenches, which can be associated with convergent plate boundaries, ripples, and sand ridges. These features are created by the interaction of currents and waves. Additionally, the benthic realm, beneath the pelagic zone, includes the deepwater region beyond the continental shelf, composed of sand, silt, and dead organisms. This region has a high level of nutrients due to the decomposition of organic material, supporting a diverse range of marine life.