Answer:
I can't answer 13, but 14 is silk, ancient China kept secret the way to make silk because (15) it gave them an advantage in trade (the silk road) because other countries would trade their goods for silk since china wouldn't tell them how to make it. Hope this helps!
Scientists use radiocarbon dating to estimate the age of artifacts
Answer:
Nigeria because south Africa is limited while Nigeria have more resources
Answer:
D
Explanation:
The welfare of the country will be secured
