Which of the following statements is not part of the cell theory? A) All living cells come frondivision of preexisting cells. B) All cells are surrounded by a cell wall. C). A cell is the smallest unit of life, individually alive even as part of a multicelled organism.​

B is not part of the cell theory; there are many types of cells that do not have cell walls, so the statement cannot even be generally true.

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.

The correct answer is c