As there is oxygen in water (H2o o=oxygen) , if there is water there is oxygen, so yes.
plants
no oxygen and crushing pressure
These organisms do not need oxygen. They are called anaerobes.
no
There is hardly any oxygen available at low depths, thus making oxygen a survival challenge in the deep.
Any animal need oxygen for respiration.
Oxygen is used in welding, by the deep sea divers and is also used in hospitals to patients with breathing difficulties.
The phrase "deep blue sea" means any deep water - if you have ever seen really deep ocean or lake water, you know that it is a really deep blue, almost black, color.
95-98%helium 2-5% Oxygen
an example is any sea or ocean because it is just measuring how deep it is
Pure oxygen is toxic, especially at high pressures. Nitrogen is also toxic at high pressures and so is replaced with helium, which is completely inert.
it does not evolve at any level. to evolve it, trade it while its holding a deep sea scale or a deep sea tooth