24- Quel est le rôle de la gaine de myéline qui entoure l'axone de chaque neurone ?

What is difference between an epidemic and a pandemic? a) an epidemic is a disease; a pandemic is a treatment. b) an epidemic is restricted to a local region; a pandemic is global. c) an epidemic has low mortality; a pandemic has higher mortality. d) an epidemic is caused by a bacterial infection; a pandemic is caused by a viral infection.