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Advantages of tissue valves compared to mechanical valves include the avoidance of lifelong warfarin therapy to prevent the development of blood clots. A disadvantage is their relatively poor durability compared to mechanical valves, with many requiring a re-operation in 10 to 20 years.
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C. is the answer to the question
I think c... after the Soviet union exploded their first atomic bomb in 1949 the American public was nervous since they knew what a bomb like that could bring.
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Explanation:Girl what did you get I’m on that question too
The middle ages economy was characterized by deep social stratification and a largely agricultural system.