Answer:
a. serve a purpose and are not easily modified.
Explanation:
In psychology, gender-role stereotypes are generalized ideas about the behaviors that we expect from men and women. In other words, it's the preconceptions we have about how men or women should behave, dress, act, etc.
These gender roles are not easily modified because they have their roots in the culture and they serve a purpose of differentiating men from women (although this might not be correct since we are talking about generalizations).
Therefore, from the options given we can say that gender-role stereotypes a. serve a purpose and are not easily modified.
Answer: No
Explanation: Most 18 - 21 year-olds have recently finished school, and may/may not be working and/or studying further. They may have all of the rights and allowances of an adult, however, most have not yet experienced the responsibilities that come with adulthood, such as renting and managing their own homes, and where an option of returning to the parental home is not an option.
Two effects of the alantic slave trade is goods and clothing to sell in Europe, increasing the numbers of African slaves brought to the new world.
Think of it like this — if American leaders had never made the *decision* to break away from Britain, America would still be a colony of Britain.
Decision making determines the course of events. This is because a certain decision will then trigger certain actions, which in the grand scheme of things will impact history.
Example; American leaders made the *decision* to break off from Britain, triggering the Revolutionary War and America’s Independence, thus that decision changed history.
The 
would enable a woman to assess a man's level of commitment, detect the existence of prior commitments to other women or children, and simultaneously signal to the man her sexual fidelity.
