Three students are testing which method can melt an ice cube in a plastic bag the fastest.
The first student holds her ice cube in her hands. The second student sits on his ice cube. The third student leaves her ice cube on
her desk
What is the variable, or the factor that changes in this experiment?
A. the type of plastic bag
B. the method used to melt the ice
c. the number of ice cubes
D.
the starting temperature of the ice

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.