Yes.
I think, no. We need oxygen and hydrogen to make water so with only oxygen and no hydrogen we would have no water and life as we know it cannot exist without water
They can't survive without oxygen but they can survive with an oxygen mask that scuba divers use and with supply of oxygen of course .
Not enough nutrients, energy, water, proper environment, and oxygen
food, oxygen, and water to survive.
Every living creature needs oxygen to survive. Just as every living creature needs water to survive. For example, such as spiders. Yup, spiders do to need oxygen AND water to survive, and of course food. So the answer to your question would be yes, snails do need oxygen to survive.
Yes, octopuses need oxygen to survive as they breathe through gills, extracting oxygen from water to support their respiration.
Aquatic organisms need oxygen to survive
water sunlight + oxygen
Because they can.
They can survive in water because water contains oxygen molecules that let them breath in and out.:)
they drink the water and suck out the oxygen and push the water out the gills
An alien would presumably not need to breath oxygen as if they have some kind of ESP, they don't even exist. Edit- i doubt they do exist too but if they did, there's no reason to believe that they would have some special ability like ESP. I wasnt talking about some super alien race, just a creature who can survive and all creatures on earth need oxygen, water, and some form of food. there are trace amounts of oxygen on mars (in the form of iron oxides, unusable by us but might possibly be used by them) but the other two are still missing for an alien to grow and develop unless their chemical compound is that different