1 is false, waves can't propagate in a vacuum.
Answer:
Culture
Explanation:
According to Schaefer (2002), the transfer of ideas, customs, values and artefacts among a group of people leads to learning environment where the socially transmitted customs, knowledge, material objects and behaviour is learned over time. This is then combined with the previously learned customes and behavior and leads to the formulation of a different culture. The totality of learned, socially transmitted customs, knowledge, material objects, and behavior is simply known as culture.
The correct answer is 20 minutes.
According to psychologist and philosopher William James, attention “is the clear and vivid possession by the mind of one of several simultaneously possible objects or schemes of thought. Focus and concentration of consciousness are its essence.
In the 1920s, the danger of buying stock on credit was that if the stock dropped, borrowers have to make up the difference.
When the stock dropped, basically the borrowers losing an amount of value of his assets. But since he bought the stock before the price was dropped, he had to make up the difference
