Answer the following about Hanta virus:
Where did they occur?
How did they start?
How did they spread?
How deadly are they?
Is there a vaccine?

Hantavirus is named for the Hantan River area in South Korea where an early outbreak was observed. This might have been the origin point. Hantavirus must have started when a human being came into contact with rodent urine, feces or saliva. Hantavirus can be spread in the same exact way. Either that, or a rodent may have come into close contact with a person. A few examples of this are bites and scratches from infected rodents. The mortality rate can be anywhere from 5-36%. In 1990, the first vaccine was developed to fight the Hantan River virus, possibly an early form of Hantavirus. However, as of 2012, no vaccine has been developed against American or European strains of HantaVirus.

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on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.