What part of the Mississippi River do you expect there to be less algae
and less bacteria?

Dead zones can be found worldwide. ... zone is an area of hypoxic (link to USGS definition) (less than 2 ... Its area varies in size, but can cover up to 6,000-7,000 ... the northern Gulf of Mexico, beginning at the Mississippi River ...

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.