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6. which of these advances did Han scientists make? select all that apply. A. created more accurate calendars, B. devise the base-20 number system, D. developed the concept of zero, D. created a process for the manufacture of paper.

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Answer:

Correct answer A. created more accurate calendars

Correct answer D. created a process for the manufacture of paper

Explanation:

The advances that were made by Han scientists include:

A. created more accurate calendars.

D. created a process for the manufacture of paper.

  • The Han era was about 400 years ago in China. The Han scientists are noted for the invention of paper, seismograph, calendars, used water clocks, etc.

  • The Han scientists used a crude material which was gotten from the fiber of hemp which was found in a tomb. This was used in making paper which they used in writing.

  • They were also vital in creating calendars and seismographs. The seismograph were used in recording the motion of the ground whenever there was an earthquake.

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