Do crawfish breathe water, or air?
Crayfish, crawfish, or crawdads are members of the superfamilies Astacoidea and Parastacoidea - are freshwater crustaceans resembling small lobsters, to which they are related. They breathe by extracting oxygen from water using their gills. Gills simply provide a large surface area for contact between blood and the water, so that oxygen can diffuse from water into the blood efficiently. ChaCha!
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About Water
Water is by far the most important substance on Earth. Water covers over 70 percent of the planet and makes up between 50 and 75 percent of the human body. In fact, it's one of the only things we are positive needs to be present for life to exist. When scientists look for life in our solar system and on exoplanets, they are looking for liquid water.
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