What path does a molecule of o2 take from the nose to the respiratory surface? pharynx → larynx → trachea → bronchus → bronchiole → alveolus larynx → pharynx → trachea → bronchus → bronchiole → alveolus pharynx → larynx → bronchus → bronchiole → alveolus → trachea pharynx → larynx → trachea → bronchiole → bronchus → alveolus?

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

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.

All vaccination should(n’t) be mandatory! 1.at least 5 sentences explaining 2.why? 3.in the end summarize the sentence