According to the author, what is most responsible for influencing our perception of a comparison between species?

Answer: The organizational scheme imposed on the living world by researchers and philosophers.

Explanation:

To figure this out, you need to understand the content, form, and function of the text.

The author opens by explaining how "the world can be classified in different ways," which is in line 1, and it states that "the classifications determine which comparisons seem natural or unnatural, which literal or analogical," which are in lines 3-6. The passage then shows how comparisons differ according to which system of classification is used.