This sequence can be modeled by

, and that if n is even, the number becomes negative. So the seventh number would be 3^6, and that is 729, since 7 is odd.
Answer: Evolutionary Psychology Explains Behavioral Skills
The ability to communicate complex thoughts was beneficial for human survival, and, as a result, language acquisition abilities evolved and advanced through the process of natural selection
I think it is the first one
Is this a multiple choice question..?
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