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hsajem hsajem
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6 years ago
The heart is protected by:
 
  a. the pericardium. c. the valves.
  b. the arteries. d. the atria.
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tbh1227tbh1227
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6 years ago
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hsajem Author
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6 years ago
You make an excellent tutor!
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Yesterday
Brilliant
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2 hours ago
Good timing, thanks!
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