LET ME EXPLAIN:
➖1st question: FALSE
According to the text, the human skeletons in Anyang tomb were of human slaves, not soldiers. So the answer is FALSE.
➖2nd question: NOT GIVEN
Ambergris's cost increased recently. So we must find the information in the passage describing the cost of ambergris witnessed an increase recently. But the passage does not contain this information, it just shows the price of ambergris is about 20 USD per gram.