A monotheistic religion worships only one god, a polytheistic religion worships many gods. Examples:
Monotheistic: Islam, Judaism
Polytheism: Hinduism, Buddhism
The answer is "Heritability".
Heritability reflects the way that all people in any types of living things contrast from multiple points of view among each other. The variety (~differences) among people inside a species relies upon both genetic and ecological contrasts. For instance, individuals differ in height.
I believe the answer would be C. (Along China's east coast due to the fertile soil found along the Yellow River and the Yangtzi River)
