11. PART A: What is the central idea of the text? O A Bringing back larger bills will cause more harm than
good.
OB Online banking is a convenient and secure way to
trade goods.
OC Cashless societies are more vulnerable to disasters
and to cybercrime.
OD The U. S. will be the first country to become a
completely cashless society.

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.

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