GMAT Official Guide 2018 Verbal Review by GMAC (Graduate Management Admission Council)

Author:GMAC (Graduate Management Admission Council)
Language: eng
Format: epub
ISBN: 9781119402404
Publisher: Wiley
Published: 2017-05-11T00:00:00+00:00

This fact only helps indicate that there was a decline; it tells us nothing about what caused the decline.

Correct. This statement properly identifies a point that logically completes the argument: it explains how the fossilized mastodon remains could be used to help determine what caused mastodons’ extinction.

The point at which mastodons became extinct is not part of this argument, which is concerned with the cause of their extinction. The only way in which this could be relevant to the issue at hand is if mastodons became extinct before humans took up hunting mastodons—but the argument includes no information on whether this was so.

Not knowing when humans began hunting mastodons would have no effect on the argument, which is concerned with how mastodon fossils, combined with knowledge about how food scarcity and hunting affect mastodon reproductive maturity, can help determine how mastodons became extinct.

This fact only shows that food scarcity may have led to mastodon’s decline. It tells us nothing about whether fossilized remains can help determine whether it was food scarcity or human hunting that actually led to the decline.

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