Which of the following is true about the hierarchy or organization of life? (Check all that apply)
A. Changes at the lowest level can affect the more complex levels.
B. Cells make up tissues.
C. Cells are made up of macromolecules.
D. Tissues make up organs.
E. Starting at the most basic level is the atom.

E. Starting at the most basic level is the atom

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.