How has the discovery of 5,300-year-old ötzi, the iceman, scientists in their knowledge? a- ötzi, the iceman, was as old as previously thought.
b- ötzi, the iceman, existed at a time when the climate was warm.
c- precise knowledge about his food and clothing is available.
d- humans from that period are exactly same as modern humans.

B. Otzi the iceman existed at a time when the climate was warm is the correct answer.

Explanation:

Otzi the icemen is the mummy of a man who lives about 5300 year ago, It was found by German hikers in the Schnalstal glacier near the border of Italy and Hungary. Otzi is Europe's oldest human mummy. Research has revealed that he had died due to injuries and cuts on his body. The mummy is believed to be 5300 years old. It revealed many facts about  the climate of Earth 5000 years ago. It gave insight into the warm interval that lasted 10,000 years ago because there are no glacial sediments to to study this period.

answer; people where able to travel across the u.s.a faster than any other mode of transportation,travel time was about a week,from coast to coast

it's lower nubia : ) good luck