Why was the silk road closed during the tang and song dynasty?

B

Explanation:

There were no merchants on the road, and the towns along the route lost their usual bustle, which undoubtedly led to the decline of the silk road. By the time of the Song dynasty, another ethnic minority broke the silence of the silk road once again.

1. state-issued photo ids. provide them for free for those who can't afford them.

2. the system we have seems to be working nearly perfectly. seems like about 31 cases per billion votes cast

3. the national policy for hiring new employees which requires proof of eligibility to work. there are something like 20 types of identification which can be used for this.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.