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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
Good timing, thanks!
deathwing
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Yesterday
Just got PERFECT on my quiz
lubennick
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2 hours ago
This helped my grade so much Perfect
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