The american red cross recommended that person living with aids patients should not share razor blades and toothbrushes. it is safe, however, to share bar soaps and hand towels. explain the difference.

Why are adults bigger than they were as children biology

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.

This is the interaction of two organisms where one is and the other is neither nor harmed.