For which of the following disease is there a vaccine?
a.
malaria
c.
encephalitis
b.
yellow fever
d.
cholera

why might global warming cause the spread of diseases caused by insects?
a.
warmer temperatures mean warmer winters which kill off less bugs and disease.
c.
warmer temperatures make bugs more active
b.
warmer temperatures allow the bugs to increase their habitat area, spreading disease into new areas.
d.
a and b