To safeguard against groundwater contamination, sanitary landfills are to safeguard against groundwater contamination, sanitary landfills are located on slopes so water runs downhill located on industrial sites where groundwater is not used for drinking or agriculture lined with cement lined with plastic and compacted clay located in unpopulated areas

Which symbols below represent the ions found in the glass of water ? a. oh- and h+ b. co2 and o2 c. o2 and h2 d. nh3- and h+

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

18. which statement about cancer is true?