Answer: There are many risks. Online auctions are one of the most successful business in the internet.
In this cases can happen manipulation, the products can be fake, the site may be not real, fraud.
It is important to have knowledge about the site and, do some research before buying, is important to protect yourself.
I believe the answer is theoretical model
A theoretical model is the foundation that could be held to support a certain theory for a certain research or study.
From the example above, the study is build on a foundation that both behavior and environmental factor could affect the subjects' overall health
Most of the time it would be beachhead, but it can also be drop-offs, cliffs, etc
hope this helps
Answer and Explanation
Introspection was Method by which trained observers carefully reflect and report on their mental experiences.
The fundamental problem with the introspectionist school of psychology was that the use of introspection as an experimental technique was often criticized because Introspection was limited in its use; complex subjects such as learning, personality, mental disorders, and development are difficult or even impossible to study with this technique and also different observers often provided significantly different responses to the exact same stimuli This was a bigger challenge to introspectionist school of psychology
Most of the workers who worked on the tobacco plantations located in Virginia in the 1600's are mostly indentured servants. Indentured servants are individuals (both men and women) who signed an agreement, also known as "an indenture" in which they agree to work for a certain amount of years in exchange of transportation to Virginia, and once they get to Virginia, other essentials such as food, shelter, and clothing are given to them.