The term 'Living in the Open Sea' refers to organisms that inhabit the open ocean, away from the shoreline. This type of environment is known as PELAGIC, which is derived from the Greek word for 'open sea'. PELAGIC organisms are adapted to living in the vastness of the OCEANIC environment, where they can move freely and feed on the abundant resources available. OCEANIC is another term used to describe this type of habitat, which is characterized by its large size and depth.