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Difficulty: MediumIdentifying Necessary Assumptions

Anthropologist: The recent excavation of sophisticated bone tools at the Marak cave site, located in a soil stratum dating back 80,000 years, challenges the accepted timeline of human cognitive development. Because shaping these tools requires the ability to conceptualize a multi-step manufacturing process, humans must have developed advanced abstract reasoning abilities much earlier than the widely accepted 50,000-year mark.

Statement: The anthropologist's argument necessarily assumes that the bone tools were not introduced into the 80,000-year-old soil stratum by human populations living at a significantly later date.

Answer: Answer

Answer

True, because ruling out the possibility that the tools were left by a later population is strictly required for the argument's conclusion to logically hold.
The correct evaluation is True. The argument relies exclusively on the age of the soil stratum to date the tools. A 'defender' assumption is required to rule out alternative explanations that would sever this connection, such as the tools being buried in the older soil layer by later populations.

Step-by-Step Solution

1
Identify the argument's core structure.
Premise: Bone tools requiring advanced reasoning were found in 80,000-year-old soil. Conclusion: Humans developed advanced reasoning at least 80,000 years ago.
Deconstructing the argument is necessary to understand the logical leap between the presented evidence and the author's conclusion.
2
Analyze the provided statement.
The statement claims it is necessary to assume the tools were not deposited by later inhabitants into the older soil.
Clarifying the statement's exact meaning is required before testing its logical necessity.
3
Apply the Negation Technique.
Negated statement: 'The bone tools were introduced into the soil by later populations.' This means the tools themselves are younger than the soil they were found in.
The Negation Technique is the definitive test to verify if an unstated premise is a necessary assumption.
4
Evaluate the impact of the negated statement on the argument.
The negated statement destroys the argument because if the tools are younger than 80,000 years, they provide no proof of 80,000-year-old cognitive abilities.
Because the negation causes the argument to entirely fail, the original statement is confirmed as a necessary assumption.

Key Concept

Identifying Defender Assumptions using the Negation Technique
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Topics

Identifying Necessary Assumptions

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