Which of the following is a potential problem when assesing the fit of the human brain to the glia-neuron ratio versus ln(brain mass) trend observed in other species.
1. The brain masses are not normally distributed.
2. ln(brain mass) is not normally distributed.
3. We are performing extrapolation.
4. The co-efficient of determination (R2) is too low.
Is the answer 1, 2, 3, or 4?
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