PrepTest 150, Section 1, Question 21
It might reasonably have been expected that the(461 more words not shown)
The authors would be most(10 more words not shown)
- ASmall teeth and(11 more words not shown)
- BBecause of its(17 more words not shown)
- CEarly humans did(11 more words not shown)
- DThe properties of(14 more words not shown)
- EThe human digestive(7 more words not shown)
Reading the passage
The authors link two things: raw meat can be tough to chew, and cooking may have contributed to a reduction in human teeth and jaws. That gives us a concrete way an adaptation to cooked food could make a raw diet harder to manage.
Working the answers
- ACorrect
Smaller teeth and jaws can limit the ability to handle tough raw food. The second paragraph introduces dental reduction while asking what limits our ability to use raw food. Together with the first paragraph's chewing obstacle, that supports this connection. The answer does not claim small teeth are the only limitation.
- B
Homo ergaster appears in connection with an early reduction in tooth and jaw size. We are not told that it relied on plants or had a smaller intestinal volume than modern humans. Neither claim is supplied.
- C
Nothing says early humans ate no plants before cooking. The discussion of raw plant food's low digestibility does not mean it was absent from earlier diets. This invents a sweeping dietary restriction.
- D
A high raw-meat diet is the traditional explanation mentioned in the last paragraph. The authors offer cooking as an explanation that may work at least as well. They do not establish that adaptation to meat was the primary cause of human digestive anatomy.
- E
The authors describe reductions in teeth and jaws and consider evolutionary changes in the gut. The suggestion that digestive anatomy changed little does not fit that account.
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