Critical Reasoning (CR) | Re: Researchers have long noted strange grooves near the gum lines on

­ E. The grooves occur on the teeth of some early humans whose remains were found at places where no grass suitable for tooth picking would have been obtainable during theirlifetimes.

The anthropologist proposes that the grooves were caused by using grass stalks with abrasive silica for tooth picking.

If remains with the grooves are found in locations where suitable grass wasn't available, it would challenge the hypothesis.

This finding would directly contradict the idea that the grooves are evidence of using grass stalks for tooth picking.


Let's analyze why the other options are lessuseful:

A. Similar decayrates: This doesn't directly address the cause of the grooves, only the health of theteeth.


B. Grassavailability:  

If dental remains without grooves are found in areas where suitable grass for tooth picking existed, it suggests that access to suitable grass alone does not guarantee the presence of grooves.

However, it doesn't directly address whether early humans with
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Statistics : Posted by Gemmie • on 13 Aug 2023, 04:00 • Replies 12 • Views 9664

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