Q. What is the approximate time required for a heart-beat ?
A. 0.5 second
B. 0.8 second
C. 0.5 minute
D. 1.0 minute
Answer: 0.8 second
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A. 0.5 second
B. 0.8 second
C. 0.5 minute
D. 1.0 minute
Answer: 0.8 second
