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It is understood from the passage that............... .
All plants and animals depend on oxygen to grow and
live. This gas is taken in during the process known as
breathing or external respiration. Simple organisms are
able to absorb oxygen through the surface of their bodies,
but most larger animals require a special area, which in
mammals, for example, is situated in the lungs. Fish are
equipped with gills, where oxygen is extracted from the
water taken in and passed into the bloodstream. Some
other animals which live in or near water, such as frogs,
have moist skin through which the gas is able to
permeate. Whichever way it is absorbed, the use made of
oxygen taken in is known as internal of chemical
respiration.