ostichs is dont know
using their gills they obtain oxygen from the top of the water.
Plants obtain oxygen during photosynthesis from water molecules.
Squid obtain oxygen from the water by passing it over their gills. As water flows through the gills, oxygen is absorbed into their bloodstream and carbon dioxide is released back into the water. This allows the squid to extract oxygen from their watery environment for respiration.
Cnidarians are able to absorb the oxygen they need from the surrounding water by diffusion.
Every animal breathes oxygen, even fish (they obtain it by the oxygen in the water).
same way the fish do
by drinking water
The two main sources for obtaining oxygen are the air - 23% of air is oxygen - and water by electrolysis.
Frogs obtain oxygen underwater through their skin. They have specialized skin that allows them to absorb oxygen directly from the water, which helps them breathe while submerged.
Most do. Some use municiple water supplies, but those in rural areas burn hydorgen and oxygen, and collect the condensate.
Sharks are a fish. Fish have gills that extract oxygen directly from the water in which they live.
Oxygen is not use.Oxygen is produced in photosynthesis when breaking of water molecules to obtain electrons.