Free Practice Question
CR · Critical Reasoning
555-605
Weaken
Charcoal from a hearth site in Utah, 2,500 miles south of Alaska, is known to be 10,500 years old. Researchers concluded that, since glaciers blocked human migration south from the Alaska-Siberia land bridge between 17,000 and 10,000 years ago, humans must have arrived in the Americas more than 17,000 years ago.
Which of the following pieces of new evidence would cast doubt on the conclusion drawn above?
Which of the following pieces of new evidence would cast doubt on the conclusion drawn above?
Answer Choices
Sign in to reveal the correct answerA
(A) A new radiocarbon dating technique revealed that the charcoal from the Utah site was at least 10,700 years old.
B
(B) Another archaeological site was discovered in Arizona with artifacts dated at 15,000 years old.
C
(C) A simulation of glacial movements indicated that it would have been impossible for humans to travel south overland from Alaska 18,000 years ago.
D
(D) New radiocarbon dating techniques confirmed that an ice-free corridor allowed migration south from the Alaska-Siberia land bridge at least 10,700 years ago.
E
(E) Research on various hunter-gatherer groups demonstrated that, once the glaciers receded, humans could have migrated from Alaska to Utah in approximately 25 years.
Reveal the correct answer
Sign in for free to check your answer and unlock the full explanation.
Track your performance and improve
Get detailed analytics, unlock full explanations, and move up difficulty tiers as you practice.
Explanation
Unlock the full explanation
Create a free account to reveal the correct answer, see the step-by-step explanation, and start tracking your GMAT progress.
Comments
4
Sign in to join the discussion
C
CharminglyJan 7, 2025
Thankss
Details
Difficulty
555-605
Type
CR