23. How did the formation of glaciers result in the first humans coming to America? a. a land bridge formed between Asia and America
b. sea levels rose and flooded coastal areas
c. the Bering Strait was created
d. two masses of land were divided

a. a land bridge formed between Asia and America

Explanation:

Climate Change allowed the biggest human migration. Due to climate change, a land bridge called  the Beringia land bridge was formed between Asia and America, that helped Paleolithic hunter-gatherers to enter North America from the North Asian via foot or mammoth.

The formation of land bridge was due to the lowering of sea level during the Last Glacial Maximum that caused biggest human migration.

Hence, the correct answer is "a. a land bridge formed between Asia and America".

it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

explanation:

explanation:

the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali