Multiple Choice
The way chimpanzees in West Africa crack open oil-palm nuts requires observation and practice.After a great deal of practice,they are proficient by the age of:
A) 4 or 5.
B) 5 or 6.
C) 6 or 7.
D) 7 or 8.
E) 8 or 9.
Correct Answer:

Verified
Correct Answer:
Verified
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