Papaverine means ______________.
A. a period of change
B. a substance that causes sadness
C. the biology of tiny organisms such as fungi and virus
D. a painkilling drug containing the juice of the opium poppy
A. a period of change
B. a substance that causes sadness
C. the biology of tiny organisms such as fungi and virus
D. a painkilling drug containing the juice of the opium poppy