The vagal response is an automatic reflex that happens within your body when your vagas nerve is stimulated. This reflex affects your central and peripheral nervous system, as well as your cardiovascular system and therefore a sudden stimulation of this reflex can set off a variety of symptoms.
Deep sea zones. The deep sea or deep layer is the lowest layer in the ocean, existing below the thermocline and above the seabed, at a depth of 1000 fathoms (1800 m) or more. Little or no light penetrates this part of the ocean, and most of the organisms that live there rely for subsistence on falling organic matter produced in the photic zone.
This coincides with the average depth of the bottom of the euphotic zone, which means that the deep sea is also a dark sea. The average depth of the sea is around 4,000 m (almost 2.5 miles) and the deepest point in the Mariana Trench is about 11,000 m, so there is a lot of deep sea around the world!In fact, about 90 % of the worldâs ocean is deep sea.Not having any sunlight doesnât mean that animals living in the deep sea donât rely on it. Plant and animal matter from the euphotic zone sinks through the water column and eventually reaches the deep sea.This organic matter is known as âmarine snowâ, and most deep-sea animals rely on it as a food source.n fact, about 90 % of the worldâs ocean is deep sea. Not having any sunlight doesnât mean that animals living in the deep sea donât rely on it. Plant and animal matter from the euphotic zone sinks through the water column and eventually reaches the deep sea.