Reading Comprehension (RC) | It is so uncommon for a rarified academic term to make the leap.

Question 3
Could somebody give their two cents about how the passage asserts that the model drawn from Biological sciences may "best" explain the dissemination of an image across Web sites? I think I am getting a bit lost in the undertones of the passage since I do not really find any comparisons with other models.
Or perhaps it's a matter of which answer is the most "fitting"?

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