If you mean the free gas - it's ALL from photosynthesis by green plants.
Whales come to the surface to breathe air through their blowholes, as they are mammals and need to breathe oxygen to survive. They also come to the surface to regulate their body temperature and communicate with other whales through vocalizations.
Reptiles don't get oxygen from the water. All reptiles have to come up to the surface to breathe, but can hold their breath a long time.
Dolphins go to the surface because they need air (oxygen) to breath and fish can air (oxygen) from the water.
Jellyfish live under the water and get their oxygen from the water itself therefore they do not nee to come to the surface to get air.
No, they aren't a mammal like a whale or dolphin so they breathe using the oxygen in the water.
Water scorpions have air tubes that stick out of the water surface to take in atmospheric oxygen. They come up to the surface several like Dolphins and Whales.
They come to the surface of the water, exhale the carbon dioxide they have inside their lungs. Then the intake oxygen from the atmosphere and go back under water. After they run out of oxygen the go back to the surface and repeat the process.
Goldfish come to the top of the water to breathe air because they have a special organ called a labyrinth organ that allows them to take in oxygen from the surface.
This is normal for a great many fish. In nature there is often food at the surface (bugs and such). It can also mean that there is not enough oxygen in the water. If the fish are starved for oxygen they will look elsewhere for oxygen. They will put their mouth at the surface and open and close it. It almost looks like they're trying to blow bubbles. If this is the case, get an air pump and aerator and put it in the water. The bubbles flowing through the water will add oxygen to the water.
A clean aluminum surface reacts very rapidly with oxygen, but the surface is quickly covered with a surface passivating layer containing aluminum and oxygen that prevents further rapid reaction.
What language did the element oxygen name come from
Earthworms breath by absorbing oxygen through their skin from the moisture in the ground. After heavy rain soaks into the ground it can lose the oxygen in it and the worms can not breath. They come to the surface as not to suffocate. Earthwormsinfo