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Rodas Rodas
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6 years ago
Among scientific observations by Song intellectuals was
 
  a. the explosion of the Crab Nebula in 1054
  b. the discovery of sun spots
  c. invention of a zero for mathematic calculations.
  d. retrograde motion of Mercury.
  e. recirculation of blood through the arterial system.
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AseizeAseize
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6 years ago
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Rodas Author
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6 years ago
Helped a lot
sleinhi
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Yesterday
Smart ... Thanks!
yen
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2 hours ago
Correct Slight Smile TY
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