Questions 31-40

Complete the notes below.

Write ONE WORD ONLY for each answer.

Theories on early human migration to the Americas

Humans migrated from Northern Asia to Alaska via a land bridge.

• The area consists of a dry grassland plain up to 2000 km².
• The winter is cold and long with strong winds but free from 31.
• The earliest group of humans followed 32 to Alaska.
• Anthropologists found similar shaped 33 in people in Northern Asia and in North America.
• The land is covered with glaciers, which makes it difficult to find 34.
• The other evidence was in the form of 35 for hunting.

Some scientists believe first settlers moved from North to South.

• But no 36 have been found to support the theory.
• Excavations revealed dozens of people living in some huts by a stream.
• Scientists found a variety of 37 as seaweed in the sea.

However, some archaeologists did not believe the first humans arrived via Alaska.

• They thought the 38 was too bad for humans to survive in.
• They doubt the 39 skills of the early people for such a long voyage.
• People believe the theory because there is a strong 40 in the Pacific Ocean.