What was the Silk Road? a series of roads that were covered in silk imported from China
a four-thousand-mile canal used from 1300 BCE to 1453 CE
a single ancient trade road that connected China and Japan
a series of ancient trade routes that connected China with Europe and East Africa

D.a series of ancient trade routes that connected China with Europe and East Africa

Explanation:

The answer is D because it was a trade route connecting China, Europe, East Africa during the 130 b.c it was used for trading such as gold, silver, and many more. There's was a problem with the silk road because the first geography route was complicated and most of the passages they traveled on were narrow and somewhat dangerous, There's was also diseases spreading such as chicken pox, Measles.

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john hunter was a scottish surgeon, he was a early advocate of careful observation and scientific method in medicine,

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monitor contract compliance and results of forestry activities to assure adherence to government regulations.  

plan and supervise forestry projects, such as determining the type, number and placement of trees to be planted, managing tree nurseries, thinning forest and monitoring growth of new seedlings.  

establish short- and long-term plans for management of forest lands and forest resources.  

determine methods of cutting and removing timber with minimum waste and environmental damage.  

supervise activities of other forestry workers.

by the way there is no video here.