What temporary land mass linking siberia and alaska is thought to have allowed hunter-gatherers to migrate from asia to north america?

The answer to this question would be “Beringia”.

Today, Beringia is  the land and marine area bordered on the west by the Lena River; on the east by the Mackenzie River; on the north by 72 degrees north latitude in the Chukchi Sea; and on the south by the tip of the Kamchatka Peninsula.

answer; ///i do believe that the correct answer is (d); ///athens had a small population;

part a. there were 250 teenagers surveyed (100% of tenagers = 250)therefore 1 % = 250/100 = 2.5 76% = 1% x 76 = 2.5 x 76 = 190 teenagers of the 250 surveyed liked burgerspart b: jane surveyed 25% (which is equal to 50 teenagers, i.e. a quarter of the teenagers surveyed is 50) to get 100% we simply get 4 quarters, i.e. multiply 50 by 4 = 200 teenagers were surveyed by jane. part c: it is impossible to give an example where a percentage is greater than 100%, since, by definition , percentage means "per 100".