a) No difference. Simply two different ways in referring to the same thing.
b) A jungle in general receives less rain than a rain forest.
c) A jungle refers to the thickest area of a rain forest
d) A jungle and a rain forest each contain their own group of distinct plants and animals.

a) Christianity
b) Buddhism
c) Hinduism
d) Muslim

a) New York (US)
b) Mexico City (Mexico)
c) Tokyo (Japan)
d) Shanghai (China)