A biological enclosure, also known as a SAC (Sacrifice Area Containment), is a structure designed to contain and protect living organisms from external environmental factors. It is typically used in research laboratories and other scientific settings to provide a safe environment for experiments or observations. The SAC is usually made of a durable material such as metal or plastic and is designed to be airtight and watertight. It can also be equipped with various features such as temperature control, humidity control, and light control. The SAC is an important tool for scientists to ensure the safety of their experiments and the accuracy of their results.