what conclusion did the researchers from university of california san diego reach regarding the best type of material to use for beach nourishment?
o large, coarse grains of sand should be used since they remain on the beach longer.
o sand mixed with soil should be used to promote plant growth and prevent erosion.
sandy areas of a beach should alternate with cement areas to prevent
o
boulders should be placed near the water's edge to prevent the current from taking the new sand out to the ocean.

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.

Compound light microscope