Answer:
a
Explanation:
After Columbus’ arrival in the Americas, the animal, plant, and bacterial life of these two worlds began to mix. This process, first studied comprehensively by American historian Alfred Crosby, was called the Columbian Exchange. By reuniting formerly biologically distinct land masses, the Columbian Exchange had dramatic and lasting effects on the world. New diseases were introduced to American populations that had no prior experience of them. The results were devastating. These populations also were introduced to new weeds and pests, livestock, and pets. New food and fiber crops were introduced to Eurasia and Africa, improving diets and fomenting trade there. In addition, the Columbian Exchange vastly expanded the scope of production of some popular drugs, bringing the pleasures — and consequences — of coffee, sugar, and tobacco use to many millions of people. The results of this exchange recast the biology of both regions and altered the history of the world.
Answer:
Identity vs. role confusion is the 5th stage of Erik Erikson's theory of psychological development. It begins at 12-18, years of adolescence. During this stage, the adolescence find themselves searching for who they are through their values, goals, and beliefs. They will look into their morales, and continue from there. This leads them into preparing for older life.
Answer:
Expectancy
Explanation:
<u>Expectancy</u> theory argues that employee behavior is based on the perception that a specific level of effort will lead to specific amount of performance and the achievement of desired outcomes.
The biggest problems cited by the united states are:
1. Budget problem
2. Unemployment
3. HEALTH care
4. Immigration
5. Poverty
6. inequality in wages
7. Decline of religion and morals
8. Civil rights and race relations.
9.Education,Environment,Media,crime.
10. Terrorism
It is important to solve all the problems that are faced by any human being. Because a human should b free of tension and should have freedom in every way he looks.
The problem that first should be addressed is poverty because it's such a problem that keeps man not a man it makes life hell.
When the united states has no poverty then it's possible to think of development and other activities. As the poverty gets kicked out then education and other things come into play.
The most important issues that need to be addressed first are
1 poverty
2 terrorism
3 crime
4 Education
The problem once overcome can lead any nation to its success.
Learn more about united states here:brainly.com/question/811755
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People who study the rocks of the earth- geologists
people who interpret the past based on what objects people have left behind- archaeologists
people who study how people lived their daily lives often through oral or written stories- historians
People who comment on important current issues- writers
I hope this helps
