Which one of these characterizes a hydrophilic substance a substance that is easily mixed with water?

Substances that are polar in nature. There is a principle in chemistry which is expressed as, "like dissolves like". This means that the substances only combines with substances of the same kind. Polar dissolves and combines well with polar and nonpolar dissolves and combines well with nonpolar. The hydrophilic substances should also be polar in nature.

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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