During a coffee break, your friend spills coffee on your lab coat and the fabric is discovered. is this a true biological stain or simply a compound capable of imparting color?

Name the types of burns one can get and which structures of the integument are damaged

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.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?