Our human body has various special ways of responding to antigens. Mostly these ways are classified into two categories: 1  Antibody-mediated immunity in which the different antibodies that are dissolved in lymph, blood and other fluids of the body bond with the antigen and activate a response (humoral immunity).he most important role in immunization is played by white blood cells or lymphocytes which are usually produced in the bone marrow and are then transported to various organs for their protection. Cell mediated immunity is also a part of this whole defense system.
Definition: A square is a quadrilateral with all four angles right angles and all four sides of the same length. So a square is a special kind of rectangle, it is one where all the sides have the same length. Thus every square is a rectangle because it is a quadrilateral with all four angles right angles. However not every rectangle is a square, to be a square its sides must have the same length. Penny.
The square is an Imperial unit of area that is used in the United States construction industry, and was historically used in Australia. One square is equal to 100 square feet.Examples where the unit is used are roofing shingles, metal roofing, vinyl siding, and fibercement siding products.Some home builders use squares as a unit in floor plans to customers.Buildings in Australia no longer use the square as a unit of measure, and has been replaced by square metres.The measurement was often used by estate agents to make the building sound larger as the measure includes the areas outside under the eaves, and so cannot be directly compared to the internal floor area.uildings in Australia no longer use the square as a unit of measure, and has been replaced by square metres. The measurement was often used by estate agents to make the building sound larger as the measure includes the areas outside under the eaves, and so cannot be directly compared to the internal floor area.