Answer:
1989
Explanation:
In December 1989, Patricio Aylwin, head of the Concertación coalition, won the first democratic election in Chile since 1970.
The transfer of plants, animals, people, and diseases between hemispheres. This would be the correct answer!!!
<span>Some theories are that the soil grew salty, disease killed many people, and the land became deforested. a</span>
Advantages: Primary sources directly address your topic and often provide information that is unavailable elsewhere. For example, the questions you compose for an interview or a survey will likely target your unique interest in the topic. Similarly, to test a particular hypothesis, you can design your own experiment.
Disadvantages: Some primary sources, such as eyewitness accounts, may be too close to the subject, lacking a critical distance. Others, such as interviews, surveys, and experiments, are time consuming to prepare, administer, and analyze. Finally, unless you have been trained in accepted methodologies, your own primary research in certain fields of study may not be recognized as valid.
