What were some ways tang dynasty improves china

Introducing Medicine, Paper and Porcelain are the some ways Tang Dynasty improves China.

Explanation:

Tang dynasty was the center of trade in the East. It was the one that contributed many to the present generation. The Tang dynasty emperors were well qualified and learned men.  

They were the ones who introduced organic materials and herbs and their medicinal benefits to the world. In those days they were the ones who found that diabetes was a condition were excess sugar was eliminated through urine by doing urine experiment.

They were the pioneers to invent air conditioner, gas cylinders, gun powders, creams and their interest were exhibited through their artistic porcelain too. They studied Math and Law which aided in the economic growth. Wooden block printing was introduced and paper was developed.

1) the answer is b

senators serve a six-year term; representatives serve a two-year term, making them more responsive to (and responsible for) voter confidence.

2) the answer is d

to serve as president, one must:   -be a natural-born u.s. citizen of the united states;   be at least thirty-five years old;   be a resident in the united states for at least fourteen years.

3) the answer is a

ella,because it is constitutionally eligible

4) the answer is c: the u.s president

what are the choices?