How do you think the Gobi Desert impacted the people and history of China? I already asked this but not one answered

To the north and west of Ancient China were two of the world's largest deserts: the Gobi Desert and the Taklamakan Desert. These deserts also provided borders that kept the Chinese isolated from the rest of the world. ... This is why the Great Wall of China was built to protect the Chinese from these northern invaders.

Explanation:

answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;

can you tell me where are the ansawer choices