Define pandemic.
a. a common trait
b. a series of wars
c. a plague of bugs that kills crops
d. an epidemic of infectious disease

Iwould say read. (b)

Band cthe nucleus of the atom

Unlike  ct scans, which use x-rays,  mri scans  use powerful magnetic fields and radio frequency pulses to produce detailed pictures of organs, soft tissues, bone and other internal body structures.  differences between  normal and abnormal tissue is often clearer on an  mri  image than a  ct.you can see more with a mri scan. for example on an mri you can see internal bleeding.