Two types of acquired immunity include inborn and passive inborn and active active and passive

Acquired immunity is a subsystem of the immune system. Acquired immunity develops after the exposure of an organism to a suitable agent and antigen or being attacked by a disease causing organism. The acquired immunity is of two types i.e active immunity and passive immunity. Active immunity is the immunity developed after being exposed to an antigen and passive immunity is acquired by birth.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.