It could be to explain something, or maybe to express something, or just to get their story out into the open.
Answer:
Scientists are creating vaccinations that prevent people from getting the bird flu. If the virus mutates, a new vaccine will need to be made. The vaccine needs to be tested, which can be dangerous. It will also take a long time for scientists to know whether the vaccine works or not.
Explanation:
The flu vaccine is injected under skin in a inactive form and the immune system responds with antibodies to the food protecting you from the future exposure to the flu. That's why sometimes you get the flu even though you got a shot because there's different forms of the flu.
Answer: In the 1960s, the South was a place African Americans fled, seeking better jobs and better lives in the North in what was known as the Great Migration. But in recent years that flow has switched and led to what’s become known as the Great Reverse Migration, with large numbers of African-Americans moving South again.
Explanation:
Answer:
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