Question

Which statement best supports the land bridge theory of early migration?

a. Fossils of the same prehistoric species have been found on both sides of ancient land bridges.
b. Ancient tools and artifacts were discovered along the hypothetical migration routes.
c. The distribution of certain plant and animal species suggests a past land connection between continents.
d. Genetic studies of indigenous populations on different continents show common ancestry linked to a land bridge migration.

Answer 1

The best statement supporting the theory of a land bridge facilitating early migration is genetic studies showing common ancestry between indigenous populations on various continents, reflecting the Bering Land Bridge migration model.

Step-by-step explanation:

The statement that best supports the land bridge theory of early migration is d. Genetic studies of indigenous populations on different continents show common ancestry linked to a land bridge migration. This theory, also known as the Bering Land Bridge migration model, suggests that during the last ice age, when sea levels dropped, humans were able to migrate from Siberia to Alaska via a land bridge. Genetic evidence among indigenous peoples supports the scenario of migrations from Asia to the Americas and dismisses other hypotheses such as the Solutrean hypothesis, which proposed a European origin. The discovery of genetic markers that show a link between populations across continents reinforces the assertions made by the Bering Land Bridge theory.