- PowerScore Staff
- Posts: 850
- Joined: Jun 12, 2017
Your proposed rewording would make answer choice E correct, although worded that way it would be redundant. In other words, the "only" in your rewording is doing the same work that the word "purely" is doing. That wording of answer choice E is correct because we do know from the stimulus that it is the size of insects' brains (and the resultant incapacity for a sufficient number of neurons) that makes them incapable of flexible/noninstinctual behavior. This means that organisms with brains smaller than insects would also be incapable of flexible behavior.
The reason answer choice E is wrong as stated is that we cannot tell from the stimulus whether, for example, there are organisms with brains slightly larger than insects, but still not large enough to contain the requisite number of neurons to exhibit flexible behavior.
I hope this helps!