Hi there!
The study of demography, and those who study it, also known as demographers, are those who study C. Human Populations.
<span>Modern psychoanalytic theory deviates from freudian theory because it focuses less on sex and more on ego. The science of Modern Psychoanalysis has demonstrated its ability to successfully deal with mental and emotional difficulties through its studies of early parent-child interactions, frustration, social relations, family dynamics and psychosomatics.</span>
The silk road was one of the only ways to get goods from other countries in that time period. People traded food, spices, skills, etc. With the trade, countries could try new cultures leading to the spread of cultures.
I think it would be conditioned stimulus but I'm probably wrong.
