Organisms that breathe arsenic discovered in the Pacific Ocean

Oxygen plays a vital role in every cell in your body, as well as the bodies of many other organisms. We use it to chemically change the food we eat and the liquids we drink into energy that then powers every other function in the body. But in environments where there isn’t much oxygen to spare, some crafty creatures have evolved to make use of other elements, most commonly nitrogen or sulfur.

Source: newatlas.com