Based on these four illustrations of diffusion, which mode would most likely be used to transport oxidized zinc (which has a charge of +2) through the cell membrane? 
Definitions:
MSE
Mean Squared Error, a measure of the average squared differences between the observed actual outcomes and the outcomes predicted by a model.
F Statistic
A ratio used in ANOVA tests that measures the amount of systematic variance between groups compared to within-group variance.
Coefficient
A fixed number or constant that precedes and multiplies the variable in an algebraic term.
Unit Change
A change or difference of 1 unit in the value of a variable.
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