Which idea best describes why the volume of water in earth’s oceans changes? large amounts of ocean water are lost to the mantle within rifts. new water is constantly added to earth’s oceans by space objects. ocean water is lost to the earth's atmosphere. ocean water is lost to space through evaporation.

Glomar challenger was a deep sea research and scientific drilling vessel for oceanography and marine geology studies. the drillship was designed by global marine inc

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.