Iam black when i am clean, i am white when i am dirty. what am i?

Smoking cigarettes is a pervasive habit found in many parts of the world and a habit that could be explained by both microsociological and macrosociological forces. give an example of each that would be relevant to explaining the proliferation of smoking. how might your suggested micro- and macro-level analyses be linked

True or false mucous membranes destroy pathogens on the outer body surface, at body openings.

Make a prediction about that person’s wellness and justify your prediction using two or more complete sentences.